Ooh, such rich material on this thread. The one about the tub of butter and the putting back of the paper flap under the lid - whyyyyy? -just throw the fucker away!
My MiL goes a step further - she actually retains the flimsy fucking flap of useless paper and throws away the LID?!?! Every time! 
When driving and I very kindly flash to let someone join the road from a side road and they spend about six hours going, "who me?" or don't notice because they're too busy being thick. What do they want, a fucking red carpet and an engraved invite??
Also, people who are feeble fucks about getting onto a roundabout (all people in my county except me) so a massive and completely unnecessary queue builds up. Get some bloody gumption, people.
People who are fussy about dishwasher loading (sorry, going against grain of thread here, I realise, but bear with me...) NSDH I'm looking at you with pain and sorrow as you take everything I've happily stuffed in machine and reload it, slowly, painstakingly, taking several million hours, all the while sighing, tutting and head shaking. Weirdo.