I have never heard cancer used as a swear. I mean, how do you even use it? "Oh that's so cancer just leaving us like that, I mean what the cancer. Cancer!" It just doesn't work man. The only thing I can really think of that annoys me like crazy is when some drunk guy is trying to talk to you at 2 in the morning. I stay up really late, so now and then after brushing my teeth I'll be walking back to my room and some drunk guy will try and spark up a conversation. This would be fine and all, except - I'm tired - I don't like a lot of people on my hall when they're sober, why would I like them while drunk? - They can't take a hint. Usually after I shut the door to my room they get the idea though. a bit like that you have to speak/understand dutch to get it :P