Lets learn some mechanic secrets

I'm curious about all those secret applications that tools are used for even though they weren't supposed too. Throw in your 2 cents with any and all ideas.

Just one of mine here: Ever lose a key to those pesky lock-nut lugnuts? Just use your handy sledge and "put" a socket over them and then hit it sideways with about 1/4 power. Now crank hard.......should pop right off.

Or removing door panels with a wire hanger bent into a "V".... just push the wire underneath the panel and then pull it back down with the "V" pinching the "doodad". Then pop toward you with authority....

You all have any more good ones??????