Mechanic: Well, your front axle shaft's CV boot needs replaced...
BoxJam: How soon? Can it wait a month?
Mechanic: Well now, it might be able to wait a month- on the other hand, you might get a mile down the road and the car'll blow up!
BoxJam: *SIGH*- Go ahead and fix it, then...
BoxJam: Do CV boots explode, or was he threatening to booby-trap my car?