“This violates my first rule of sloganeering. Always bring in a 10 year old boy to read your slogan. If he laughs, start over.”
Wise advice, too often ignored. Another variant — ask yourself if Jon Stewart could find some way to smirk at it.
I heard of this as advice for public figures, called the Leno Rule: "Never do anything that, should Jay Leno hear about it, will cause him to mention you in his monologue."