Rude people. If I hold a door open for somebody, or let them out of a junction in traffic when it's my right of way and they don't even say thank you.... Arghhhhh! Just infuriating.

Shoulder surfers! If I'm on my lunch break & reading.... "Oooh, what are you reading?" ... "What does that say?" ... "What's it about" ... "Is it any good?" Please stop reading over my shoulder & let me read in peace!