RaNdoM rPG clIcHE tIME aGaIN~

7-11 Rule. Shops never close. At the least, they close very rarely and only during certain major events. (Exception: Zelda 64)

1000 years. Frequently-occuring date in RPGs. The evil demon (or demons) shows up every 1000 years, or was sealed by the Ancients for 1000 years. Why can't they just kill them off permanently?

Ancient Flying Castle. Generic final dungeon.

And Behind Door #2... When in you are in a dungeon, and you come into a room with two doors, you generally want to go through the door further away from you, as it will have a switch or something that opens a passage behind the closer door.

Backwards Day. Whenever somebody tells you not to do something or go someplace, you should.