A bloke comes in. Asks for my help printing an A0 poster. So I show him the correct way to do his poster and show him his mistakes. His sizes were way out and some of his objects were outside of the print area.

"NO!" he exclaims "It worked fine my way the other day"

Ok so why ask!?

"Ok. I'm sorry. We'll try your way" says I "Just remember you can't put 2 pints in a 1 pint jug without emptying it first"

I reset the file to how it was when he came in and send it to print. He'll get charged £30 for a nice sheet of glossy A0 paper with a postage stamp image in the top right hand corner. I bet the cheeky fuck will also demand a refund.