Jimmy Fallon's latest "Late Night" trending topic asked people to share stories about their brothers and sisters that proved how weird they were. The hashtag? #MySiblingIsWeird.
Fallon got the ball rolling by telling a goofy story about a doll his sister had when they were kids, and within 5 minutes it was a worldwide trending topic.
You can watch part one of the video above, and part two below, but just in case you want even more weird sibling stories, the Late Night blog has rounded up the best tweets that didn't make the show.