This has already gone viral, so in case you haven't already seen it...
UGH! But at the same time: MWAHAHAH!!!
Hysterical, but this is the sort of #$#%! that my friends might/would pull on me if given the chance.
In which case, I'd probably be SOOO ticked off I woulda clobbered the guy right over the head right then and there with my camera until he REALLY did pass out!!! I'll show you how to scare someone to death on an airplane you.... oh, yeah ok never mind.