I don't often get cross but I find it infuriating in cafes/restaurants when served a mug of tea with the teabag left in it with no means of disposal.
Even a saucer or some little receptacle would do. It really gets my hecklers up. Sometimes I just have to ask the waitress/staff to remove it for me and I'm quite frosty with it too. 
50 Greatest books of all time.
Richard E Grant's Very Modern Odyessey
Things that (sometimes unreasonably) get on your nerves...hopefully lighthearted



The worst side-effect for me is that I can't eat a Magnum!