I try hard to be a nice person (not to be confused with a Nice Guy), but I have my limits. I've found, however, that it's not mean people that try my patience - it's the aggressively cheerful types, like Ned Ryerson from Groundhog Day. I have to deal daily with people who say the same inane things every time (of the "hot enough for you?" Variety) instead of engaging in Actual Conversation.
How do you deal with these people?