Oh here's one I've been meaning to bring up for a while.
Close-ups,
with amplified sound, of people eating, on television commercials (meaning that you have to watch it several times in one program).
EEEEEEEEEEEEEEEEEEEEEEWWWWWWWWWWWW.
(I'm totally looking at you, Carl's Jr. The new ad of the scruffy guy on vacation eating dripping fruit, barely avoiding a direct buffalo shot, deserves special mention.)