Not mine, but my buddy tends to run into a bunch of B list celebrities in his travels.
First one was from probably almost 15-20 years ago. He was at some convention and Lou Ferrigno was there. He's a pretty big Hulk fan, he has a Hulk #1 comic and a bunch of other rare stuff. Anyway, back then he didn't have a lot of cash though, and there was no sign saying you had to pay for an autograph. A lot of celebs at this conventions will often sign for free too. So, he has to wait in a big ass line to get up to Ferrigno to ask him to sign a Marvel Legends Hulk figure or something. He finally gets up to him and Ferrigno says "Twenty dollars," without saying anything else. My buddy, kind of surprised by the whole $20 thing, tells him that he only has $10 on him and that he's a huge fan. Ferrigno just says "Twenty dollars" again and is now getting pissed off. My buddy appeals to him one more time before getting "Twenty dollars!" again, then proceeds to tell him to fuck off and leaves.
The second story was corroborated with his girlfriend and another one of our friends. They were out drinking at a bar one night, and the WWE was in town that week. They're keeping to themselves, having a good night, when out of nowhere a glass mug narrowly misses my buddy's head and hits the wall next to him, shattering and sending glass everywhere. Instinctively my buddy gets up to see where the glass came from. It turns out it was Hornswoggle, and he was pretty damn shitfaced. He was there with JBL, Findlay, Gene Snitsky, and a handful of other guys I don't remember. When my buddy saw the other guys he sat back down and decided not to approach. Hornswoggle was being pretty belligerent and an asshole, and at that time the other wrestlers stepped in and said they would pay for my buddy's tab. After that they got the fuck out there before Hornswoggle caused further scenes.