Numbers for everything.
The probability that the walls of your bedroom will crush you if you get out of bed is very, very low. There is, however, a very slight chance. And you're quite sure that if you just stay in bed with your Volcom Numbers T-Shirt on and nurse your hangover for a few more hours (instead of going to work), there's no chance of a wall-crush. So really, it's a matter of life and death that you stay in bed.