Just had a booking with a guy for 30 mins which I charge £90 for.
Paid me £85 in notes and the rest in coins! Then when I checked at the end he was £2 short.
He reckoned he was looking round and couldn't find it then offered to go back to the car to get me the remaining £2.
Me being a soft idiot, I just let it go. He was completely full of shit, never stopped talking the whole time. Probably would have stayed the whole afternoon if I hadn't told him time was up.

Another lesson learned
