Sabu, during his match with RVD at Wrestlepalooza '98 (same show with Al Snow vs. Shane Douglas for the ECW World Title) comes to mind. And Sabu did it right in front of the camera, too.
That was the worst.
The vomit, the match, and the show.
Wrestlepalooza '98 is 3 hours of my life I'll never get back. I don't think there is one redeeming quality about that entire PPV. Not even when Shane Douglas said that Ric Flair sucks Bischoff's ass.