Too Many Groceries, Not Enough Cash

You brought a hundred dollars worth of groceries to my sales counter but you only have twenty bucks.
You knew you were bringing much more than twenty dollars worth of groceries to my counter, you suck.
People always bring too many groceries to my counter and can't pay for them.
Somehow, they believe that twenty dollars will cover it and that is very dim.
You brought a hundred bucks of groceries to my counter and I'll have to put them back.
I'm so angry that I'm giving you the finger and I don't care if my boss gives me the sack.
It's people like you who make my job more difficult and it's something that I don't appreciate.
I'm going to quit and get a job somewhere where people won't be near as likely to aggravate.

(Even though this is a fictional poem, I've heard that this happens a lot at grocery stores.)