That's Pilot Extraordinaire: Bob Hoover and it is iced tea. About 2:20 into the video.To wash down the shock of those two gif's, here's beer:
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(gotta be beer, anything else and you'd spill it if trying to pour it doing a stunt like that, right?)
[yt]http://www.youtube.com/watch?v=9ZBcapxGHjE&feature=player_embedded[/yt]