Ok, it happen last night when I was at the corner store. I bought a water bottle and went to the cashier to paid.
She told me that it was 1$ I didn't had 1$ only 2$ so I gave her the 2$ instead.
She look at me, than she said: Huh, is 1$
I looked at her like: WHAT!
Gee, 2$ is more than 1$ and the bottle was 1$ so I gave her more.