Watch the video below. It shows Canadian Football League player T.J. Lee taunting the receiver across from him. For a few second, he is seen motioning to "bring it on" to the player he's covering at the line of scrimmage. Then, once the ball is snapped and the play begins, the receiver "brings it" and TJ Lee is sent to the turf.
It's funny because he simply asked for it... and got it.