If Fameless were a scripted sitcom, it wouldn't matter -- it's hilarious. Apparently it's not, it's a hidden camera TV show and I think those who create these pranks have the best job in the universe.
Prior to Fameless I could kill hours watching YouTube prank channels, however, after a while even the best of them become repetitious and the authenticity of whether what you're watching actually being a prank comes into question. Lately, more often than not, they seem rehearsed.
I guess my favorite might be Magic Water, as I've lost count on how many times I watched it. I laugh out loud every time. Fake reality show tryouts, Deputy for a Day, fake reality show participation -- so much better than the real thing. Eventually those pranksters will become so well known the pranks will be harder to pull off -- for now I'll continue to wish there were a limitless supply of episodes :-)