The bloggers over at Tea Leaves have put together an excellent list of common RPG clichÃ©â€™s.
Personal favorites include:
12. The first enemies you encounter are always rats. You'll see.
4. Even though you may have achieved god-like powers, there are still plenty of stores that cater to your utterly superhuman needs
3. Villagers completely oblivious to your rooting through their drawers full of underwear in search of magical potions while they stand three feet away
They do leave off my personal favorite about creatures in the woods are always carrying around magic swords, shields and what not that they leave for you when they die but other than that it's a pretty comprehensive list.