I've seen a lot of debate about waterboarding lately, and while I haven't been involved in this conversation I thought I would share an account I came across of someone claiming to waterboard themselves. I say claimed, because of course it cannot be verified, though after reading it, I believe he tried it.
I waterboard! - Straight Dope Message Board
He gives a detailed account of trying all three versions of waterboarding, of which I didn't even know about prior to reading this. Regardless of if you believe him or not, I think its worth the read.
P.s. Sorry if this was somewhere in this thread, I only had time to read a page and a half.