Dewey Finn

In the opening, we are introduced to him mid-song with the rest of No Vacancy. While the rest of the band are just playing the song, Dewey over-enthusiastically dances around and riffs a guitar solo as the rest of the band (and the audience) exhaustingly wait for him to finish. Then he takes off his shirt and throws himself into a stage-dive, only to fall flat on his face when he lands on the floor. This gives us a pretty good idea of what he's like: a Large Ham who's enthusiastic about Hard Rock, but he cannot read the room and ends up acting like an Attention Whore in the process.

Example of:
Establishing Character Moment