Five Things that Really Annoy You about Other Christians
in no particular order:
1 - Signing their emails, especially their professional emails, "for His kingdom" or "in His mercy" or with some other inappropriately personal piety;
2 - being possessed of a total inability to talk about anything but "the issues" (ie: abortion, the badness of Obama, the corruption of the bishops yadda yadda yadda) while you are trying to have a fun time at the pub. GET. A. LIFE. Please;
3 - (mostly women) equating being badly/frumpily dressed with holiness and personal piety;
4 - shrieking like a vampire caught in a sunroom when you praise some Officially Inappropriate film or TV show; (actually, I have to admit that I don't always hate this, and sometimes say that I like Boston Legal or Fight Club on purpose and then sit back and watch the fun, but I'm Notoriously Mean and a Bad Catholic, so it's probably just me.)
5 - using "I'll pray for you" as a tool of emotional blackmail;
...add your own.