I have a personal experience with being accused of throwing something at a sporting event. Me and a high school friend from Detroit were at the Scottrade Center for a Blues/Red Wings playoff game back in 1998. We were both wearing our Red Wings jerseys which of course pissed off the crowd, but oh well, you're allowed to wear a different team's jersey at a game.
Of course, the Red Wings were kicking ass and getting ready to eliminate the Blues yet again, and some Blues fan in our upper section took one of those little cardboard signs that fans bring to the game that says "Let's Go Blues", and he took a sharpie and wrote "Red Wings suck!" and then made it into a paper airplane and threw it down towards the ice.
We were sitting right behind him so we saw the whole thing and didn't think much of it at the time. I ended up going to the restroom, and when I came back it was mayhem! There was a police officer in our section cornering my friend and all of the Blues fans were pointing at him/us claiming that we threw the airplane because they were mad that we were Red Wings fans and wanted to gang up on us. My friend was kind of shy so I spoke up on his behalf and told the officer that I was with him.
I told the officer that we saw who threw the airplane and if they found it, it would say "Red Wings suck!" Now why would WE write that on a sign and throw it? The officer was a real dickhead and was shoving my friend up against the wall like he was some apprehended thug and pushed his badge into my friend's face letting him know what his badge number was in case we wanted to complain.
He was getting assaulted without any "real proof" just a bunch of sore loser Blues fans word for it. The cop said he could take us down to the city jail (yikes!) and fine us $500 for littering with NO PROOF!
Finally, some arena employee came out and said we're fine and to let us go back to our seats because they probably looked on surveillance video and saw that it wasn't us. I don't remember if the Blues fan ever got in trouble.
We were pissed and went down to the St Louis city police station and complained to their internal affairs department about the officer's attitude (without any evidence) and gave them his badge number, and of course we never heard anything about it again. They're not going to do anything to their own people especially when it's 2 teenagers complaining about police brutality. They probably figured we were exaggerating.