oh, I just remembered a REALLY annoying guy...
We were setting up a gig. Kind of rough looking older guy sidles up to me and starts talking about how he's on the guest list, his friend works for a record label and told him to be here, we're probably going to get signed that night, if only I talk to the promoter, I'll see that he's on the list and MUST be let in for free...
I let him carry on for a bit, before telling him that we are the promoter, I wrote the guest list, and he's not on it.
A few minutes later there's an almighty crashing sound from the stage, where he'd climbed up uninvited and started thrashing away on the drums...