EDIT: massive apologies for bringing up and old topic. D'oh! I misread the date. Gah, it's been a while. Please excuse the newb-ish tendencies as I get back into the swing of things.
I think, technically, SUF at Georgia has it. That said, Mantis without the trim was as close as I've ever come to blacking out on a coaster. I have no idea what the actual physical measurements were, though. I imagine that forces feel greater and it's easier to start blacking out when you're in a standing position; blood is pushed to your feet rather than your dorsal side. So, SUF, probably?