I have this theory based on 3 hammers:

1. The first one is a jewelers hammer; nice and small and with a gentle tap in the right place you can fix many things
2. Next is your standard "chippies" hammer. It requires a little more force, but it generally gets the job done
3. Lastly we have the 12lb sledgehammer; if it doesn't work now it was broken anyway and needed replacing! ;)

Though there are times that you need an even BIGGER hammer. That's when this bad boy is employed: