When I was younger I always had this rule that healing items are for emergencies only. If I'm using healing potions because of normal enemy attacks, I've obviously not grinded levels enough. Though I'm getting more lenient with that rule, I still try to go up at least 5 to ten levels every time I reach a new area.
In Pokemon: When I fight against a gym leader, all of my pokemon must be within 2 levels of that gym leader's strongest pokemon. And I must only use a pokemon with type advantage moves. And I must NEVER use a pokemon with a type disadvantage.
In Super Smash Brothers: There will be NO duplicates. If I pick Wolf, you don't get to pick Wolf. (Also anyone who picks New Pork City as the level is never allowed to pick a level again.)
Games in General: If my game looks cute/has animal characters, if you say it's kiddie and call me a baby for playing it I am within my rights to hit you with my controller.

The same rule stands if you save over my save file.