Might want to look at that Receipt standing at the register. I just got hit for 30.00 I didn't buy. I can prove it, but this is rare. Most will say Look at your receipt before you leave the store.
I don't take them as "people of interest" till they do it twice. I just used to fuck with Idiots @ Grocery stores. Will That be all? Has My new Car come in yet? Rest my case.