These are things that make me cringe.
Someone wishing me a Happy Valentime's Day. There is no 'm' in 'Valentine's" Added 2/14/11
Someone asking me to take something out of the freezer so that it can unthaw. I tend to fire back with, "Why don't you just leave it in the freezer if you want it frozen?" I get that "duh?" look and I go on to say, "I think you mean "thaw" not "unthaw." Added 2/14/11