Another one I really like is : your players never miss, sometimes their opponents or circumstances make things harder though.

Examples:

• Your fighter doesn’t miss the attack, his opponent just barely manages to block it, panic in his eyes.
• You didn’t miss the jump, you just dodged a shot and rolled the fall perfectly. It seems those guards don’t want to make your escape easy.

Granted, this works in games where the player characters are presupposed heroic and competent, wouldn’t use it in Dark Heresy or Cal of Cthulhu, probably