When 9-year-old Atticus Seng's bike was stolen from a rack at his elementary school's campus this past October, the last thing he thought was that it would happen for a second time -- or that a group of teens would come the rescue.
In the surprise of his life, the Fresno, Calif. resident's luck took an unexpected turn when he was presented by Fresno High School students with a brand new mountain bike. According to ABC 30, upon hearing about Seng's bad luck, students went door-to-door of classrooms raising $360 to purchase an identical bike of the one that was originally snatched.
"That's why I'm nice to people," Seng told ABC 30. "Because I know how it feels." Watch Seng's stunned reaction in the video above.
Chandler Lacefield is another teen who didn't hesitate when it came to surprising a friend in need with a pricey gift. The Texas student graciously sold her Jeep to buy her friend's family a second car, which they greatly needed.
And earlier this year, high school senior Kyli Oleson began raising $75,000 for Gavin Jack's heart surgery, a teen who lives 160 miles from Oleson -- and who she's never met.
"When I found out about Gavin's condition, it really kind of hit home for me 'cause I realized he's a senior in high school and so am I," explained Oleson to Fox 40.
What do you think of these amazing acts of kindness? What other teens inspire you? Tell us in the comments below, or tweet @HuffPostTeen.
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Lee Kiefer: Fencing
18-year-old Lee Kiefer comes from a <a href="http://www.indystar.com/article/20120725/SPORTS/207260338/Family-fuels-U-S-fencer-Lee-Kiefer-s-fire" target="_hplink">family of fencers</a>. Three days after coming home from London, Kiefer will head to <a href="http://www.indystar.com/article/20120725/SPORTS/207260338/Family-fuels-U-S-fencer-Lee-Kiefer-s-fire" target="_hplink">Notre Dame</a>, where she will be a freshman.
Alexander Massialas: Fencing
Alexander Massialas was born to be an Olympic fencer -- his father Greg is a two-time medalist. But he's a star in his own right, making the 2012 team <a href="http://www.mercurynews.com/other-sports/ci_21129851/san-francisco-teen-alexander-massialas-makes-mark-u" target="_hplink">against odds</a>. This fall, he will start his freshman year at Stanford University.
Ariel Hsing: Table Tennis
16-year-old Ariel Hsing is your typical teenager. She likes Katy Perry and roots for Michael Phelps. But she's far from boring: She's played table tennis <a href="http://abcnews.go.com/US/ariel-hsing-16-aims-table-tennis-history-london/story?id=16852995#.UBGC9TFYsc8" target="_hplink">against Warren Buffet and Bill Gates</a>, and hopes to win the US a medal in table tennis for the first time in Olympic history.
Lily Zhang: Table Tennis
When 16-year-old Lily Zhang qualified for the US table tennis Olympic team, she told the<em> <a href="http://www.sfgate.com/sports/article/Palo-Alto-s-Lily-Zhang-is-table-tennis-Olympian-3501884.php" target="_hplink">San Francisco Chronicle</a></em>, "I've been waiting for this opportunity for so long. It's been my dream ever since I was a little kid."
Erica Wu: Table Tennis
16-year-old Erica Wu has been training in table tennis since she was a toddler. This year, her dreams will pay off. She told <a href="http://msn.foxsports.com/olympics/table-tennis/story/Wu-ahead-of-schedule-for-Olympic-table-tennis-spot-060812" target="_hplink">FOX News</a> that she's most excited about competing, the Opening Ceremony, and meeting her favorite athletes, Michael Phelps and Kobe Bryant.
Claressa Shields: Boxing
17-year-old Claressa Shields caught the boxing bug at age nine when she saw her father in the ring. <a href="http://espn.go.com/high-school/girl/story/_/id/7899778/claressa-shields-hopes-make-us-women-boxing-team" target="_hplink">He told her</a> the sport was for boys, but <a href="http://www.usatoday.com/sports/olympics/athletes/100-hopefuls/Claressa Shields/54814464/1?loc=interstitialskip" target="_hplink">her grandmother</a> encouraged her to stick with it. This year is the first Olympics in which women will be able to earn boxing medals, and Shields has a shot; she's currently <a href="http://www.usatoday.com/sports/olympics/athletes/100-hopefuls/Claressa Shields/54814464/1?loc=interstitialskip" target="_hplink">number one</a> in the nation.
Savannah Vinsant: Trampoline
Double-twisting double somersault? Not a big deal for 19-year-old Savannah Vinsant. Upon making the Olympic team, she told <a href="http://usagym.org/pages/post.html?PostID=10372&prog=tt" target="_hplink">USA Gym</a>,"I'm speechless -- I have no words for it."
Maggie Steffens: Water Polo
19-year-old Maggie Steffens, left, has a spot on the women's water polo team alongside her older sister Jessica, right. There will be no shortage of support for Steffens and the rest of the team -- <a href="http://www.nbcnewyork.com/blogs/1st-look/Olympic-Athlete-Profile-Maggie-Steffens-US-Womens-Water-Polo-162882676.html" target="_hplink">according to NBC New York</a>, all 45 of her cousins will make the trip to London to watch her play!
Reed Kessler: Equestrian
The stars aligned for Kessler to have a spot on the Olympic team: The sport requires competitors to be at least 18 and five feet tall; <a href="http://www.nytimes.com/2012/05/10/sports/olympics/reed-kessler-faces-trials-for-olympic-show-jumping.html" target="_hplink">Kessler turned 18 just 18 days before competition and only passed the height requirement this year. </a> According to the <em><a href="http://www.nytimes.com/2012/05/10/sports/olympics/reed-kessler-faces-trials-for-olympic-show-jumping.html" target="_hplink">New York Times</a></em>, she could be the youngest show-jumper in Olympic history.
Alejandra Valencia: Archery
17-year-old Alejandra Valencia found archery <a href="http://espn.go.com/blog/olympics/post/_/id/2155/unlikely-career-of-alejandra-valencia" target="_hplink">frustrating</a> at first; now, she's the second best archer in Mexico.