Post the pranks you have done in the past or any ideas you have. I once trolled someone saying lemonparty.org was a videogame site
I once made this guy think I was contributing to his thread about trolling, but it turns out I was metaposting to fuck with his head
I once trolled someone by having sex with their sister, and by 'having sex' I mean 'raping'. You should have seen the look on his face.
http://forum.romulation.net/index.php?topic=56108.msg1305883#msg1305883 The other ones were deleted. Shame really since I was actually kinda proud of a couple of them. Not sure if this would even really fit the description you're applying to this.
Hahaha the really things that prank ideas is : Grab some dynamite, than put that to inside your friends pant. Then BOOM! woola.
Well, I've gone on Chatango and trolled the hell out of people with profiles that didn't make sense. It was really great; their reactions. They'd either block you or snap at you.