I have been known to occasionally troll the comments of youtube clips of old pro wrestling vids from the 80's, acting as though I believe it was all real, and pretending to be a total mark and apologist for the bad guys - Flair, JJ Dillion, 4 Horsemen, et al. It could be pretty funny to read the reactions of those who thought I didn't know it was fake, and also those who did think it was real themselves who were marks for the "good guys".
There was a guy who posted on anabolex under a number of handles about 10-12 years ago who had to be the greatest bb forum troll who ever lived. He kept getting banned and coming back under different names - "longshanks", "Corleone", "BR1095", etc. Some of us knew he was trolling from his very first post and always got a good laugh, but it was even funnier to see the reactions of those who didn't know he was kidding who would get mad at him for his "roid rages", etc.