The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.
Give a man a fish and you feed him for a day. Teach him to use the Interwebs and he won't bother you for weeks.
Suppose you were an idiot, and suppose you were a member of Congress; but I repeat myself. -Mark Twain
I thought a thought that I thought I had thought but the thought that I had thought wasn't the thought that I had thought I had thought so maybe if I had thought the thought that I thought I thought I wouldn't of thought so much.