The NFL preseason is a time for teams to figure out what works and what doesn't, which plays work better than others and which players will round out those 53-man rosters. It also gives players a chance to practice their touchdown celebrations.

Judging from Matt Cassel's celebration on Friday night, the Kansas City Chiefs quarterback might need another series or two.

After Cassel eluded Seattle's pass rush and threw a 9-yard touchdown pass to Dexter McCluster , he ran into the end zone to celebrate with the receiver. But Cassel tried to jump on an imaginary pile of Chiefs players and ended up falling on his back. It didn't look like McCluster even realized what was going on.