Falling asleep on an airplane and, when the flight attendant comes by, the guy on the aisle doesn't get any cheese crackers for you. Or maybe, just maybe, he gets your crackers and eats them himself.
The guy who is just too important to shut off his electronic devices when it's time to take off (phone) and land (laptop). Incidentally, this guy probably has cheese cracker breath.
TV news that promises "Next! Exclusive video of the amazing rescue of a camel from a sink hole!" and then plays another entire segment with commercials at both ends before you get to see the camel video.
A center-seat passenger on a plane, age, oh, maybe 25 or 30, who feels compelled to put together a Lego® jet plane that requires pages and pages of instructions and involves cocking her elbows in the faces of her fellow travelers as she roots for the requisite Lego® and much rummaging around her fellow row-mate's collective feet for parts that zing into orbit during the deconstruction phase.
Coworkers who sing along with their iPods.
People who repeatedly say "maybe I'll be there", but can't expend enough energy to call to say they're not coming.