A thing which is harmless but drives me perfectly nuts:

[moominmolly]

Sitting in a cafe where, all the way across the room, some people are having a conversation about someone named "Molly" who is NOT ME. No amount of talking rationally with my brain lets me tune them out.

Comments

[dreda.livejournal.com]

I think this is a very reasonable thing by which to be bothered.

[moominmolly.livejournal.com]

You would!