man, i DID kick ass in a movie theater once. this kids were calling this guy a faggot near me. he had red hair, so do i. they were saying "you red headed faggot" i thougth they were talking to me. i said "are you talking to me?"--not in a clint eastwood way. :)
they said no, and something like screw off. they were about 12-14. i'm 19.
there was a back and forth exchange. i went back to buying my ticket. then they started throwing pennies at me. i turn around, they insult. i go back to it. i get my ticket, i go into the theatre and one of the idiots runs up to grab my hat. he hits me in the back of the head. i turn and take a few steps to catch him. i grab abhold of his shirt and shove him HARD to the ground. he goes down and slides about 10 feet.
i turned on my heel and went in to the theatre. there were a lot of people around including adults, i'm actually surprised i didn't get in trouble for that. :)
moral: IF it's warrented, don't be afaid to lay down the law once in a while.