It's another Simon Parkin Special! Well, strictly speaking it's not, as someone else told me about it first, but I'd much rather credit the sensual Simon. It's first person tetris. He says it'll "make you sick in 20 seconds max". YOU MAKE ME SICK IN TWENTY SECONDS MAX, Simon. Go play here.
EDIT: And because there's some confusion, the link is dead for some people and not for others. I presume it's something due to it being a new site and the DNS hasn't sorted itself out yet but - y'know - I'm not a techy.