The slip-up that cost you big

[Alan]

A friend of mine got a bit too carried away with his pressure washer and ended up stripping the paint right off his deck rail.

What's the most powerful tool that's ever cost you money?

 

[WeldandTell]

I once had a mishap with my angle grinder it slipped and ended up gnawing through a leg of my workbench. I had to replace the entire thing