Definately HBK tapping out to Angle, even though I was marking out like fuck after Orton reversed the chokeslam into the RKO. My marking out came to an abrupt end though a few minutes later.
Seriously though, as far as I can remember, Taker is the only person I can think of who has got hit with the RKO and still won the match. Foley kicked out of one, but lost after the second one. Oh well, just an observation.