Yep, that is from Alabasta, it's what Luffy and Usopp are doing when Zoro and Sanji are asleep face-to-face on the floor (I suspect it's easy to miss/forget it for that reason XD).

Oh, well, if we're both sorta feeling guilty, then neither of us should :P I know the feeling though--I WANT to but I just haven't 'cause RL is like that. :shakes fist::