Wear old bike kit and ride a little kids bike around the bar, or possibly razor scooter,
then Oscar the grouch by taking a steel garbage can and cutting the bottom out, will try crowd surfing in it.
Then either a super trooper or kokanee ranger
I have an assortment of other costumes I might whip something else together instead of the super trooper one, maybe a roller blader, I like to be able to really fuck around in my costumes