When I was a kid, I remember one strange scene in Star Trek, where Scotty said the dumbest line I've ever heard. "I always multiply my estimate by 2, so I can finish it faster then expected".
@LukeAlmighty this and always estimating your paycheck to be lower so that you'll budget better and be happy when more money comes in. i've only been disappointed after looking in my bank account a few times lol.