My favorite wasn't even my burp.

I was in college.  I got to class early and sat in my usual place in the next to the front row in an auditorium.  The professor was there getting his notes together and probably 100 students were in the room.  A friend walked up to sit next to me.  I said "Hey Jeff."  He opened his mouth to reply and a HUGE burp came out.  He had a surprised look on his face and there was momentary silence in the auditorium, then bedlam.  Jeff disappeared under the table until class started.  15 minutes of fame right there.

buuurrrrrrp!!