Man, I once knew someone exactly like that. In addition to the fact that he constantly spewed BS on a grandiose scale, he was also very large, incredibly loud, and possessed a laugh something akin to an even more stupid, adult version of Butthead on speed.
For a while he used to get really canned down at the local rock nightclub and then turn up at my mate's cellar where we all used to 'hang out' , smoke a few doobies and jam endlessly. He foolishly fell asleep in a drunken stupor on the couch a few times and all manner of evilness was visited upon his person... roaches up the nose, simultaneous dead arms and legs which caused him to writhe like a monstrous slug, that kind of juvenile stuff. The amazing thing was that he came back week after week for more of the same... The only saving grace was that he wasn't a musician.
My worst gig was probably back in the mid-80's at a high class entertainment establishment in Bootle known as the Firehouse. Some argument between the locals and the bouncers developed into full blown carnage, involving baseball bats, flying bottles etc, all resulting in various split heads. Thankfully we were skulking somewhere out of the way at the side of the stage, but it was pretty frightening stuff at the time...