To provide more detail: I've always been extremely entertained by the
I Wanna Be The Guy Let's Plays by
UltraJMan and
cloud8745 - warning, extremely NSFW language with a
ton of cussing - if you are not disturbed by that though, I highly recommend checking them out, they are pretty hilarious, especially the latter.
For those who don't know, IWBTG is a platformer that is a homage to many old NES games - platformers and otherwise - with an utterly ridiculous degree of difficulty. Literally anything can and will kill you, the whole place is riddled with utterly unexpected and highly creative traps, and the entire game is rigged to screw you over at every imaginable step in every way you might and might not expect. Which, of course, makes playing through it blindly an all the more hilarious experience - if you are appropriately masochistically minded, anyway - and makes watching someone suffer through it infinitely more amusing yet.
I've still considered it fun, in spite of its... very peculiar nature, and at some point thought that doing a Let's Play of it might actually be pretty cool - only, I couldn't possibly do it blindly, as I'd already beaten it, which would take a lot of the amusement out of it.
Now I have learnt that there is, apparently, what amounts to a successor - I Wanna Be The Fangame - which, judging by what I've seen of it, is indeed more of the same, equally insane and hilarious as the original. I don't know whether it is - I have deliberately avoided letting myself be spoiled when it comes to it this time - but it looks like it might just be that opportunity to do a blind Let's Play of I Wanna Be The Guy that I can no longer do with the original.