[Kaninen]

Working as a security guard at an art museum I get my share of stupid customers.
People will lie straight to your face about the most irrelevant things.
We have a no photography policy, so a reccuring conversation goes like this:

"Sir, I have to notify you that photography is prohibited"
"I haven't taken any pictures"
"Sir, we have 130 surveillance cameras installed here"
"..."
---
We have a lot of school classes here. Teachers are asked to sign a form upon entering with their group, which specifies our rules. Typically a conversation with teachers goes like so:
"Sir, please keep your group close together so you can monitor them"
"But they're supposed to go around by themselves to do a report"
"I'm sorry, but our rules clearly state that groups have to stay together under supervision of a teacher"
"Well, nobody told me that"
"Sir, you signed a form where you agreed to do exactly that"
"..."

Luckily, in my line of work the customer is never right, we are.