Countdown to small gifts 3/7: Cliches

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Today's topic is a repeat from last year, but let's do again, anyway--it's one of my favorite topics to read about. What are some of your favorite R/S cliches or tropes or generic storylines? (Chocolate-loving Remus or Remus and Sirius sharing a flat, for example.) Which cliches do you remember seeing around when you first discovered the pairing, and which seem to be more popular now?

You can also drop by and meet some of your fellow small gifters here:
Day 1: Introductions
Day 2: Movie magic