Me: Can I have some extra ketchup.
Teller: Oh we've run out of ketchup.
Me: (stunned silence).
Teller: But we have ketchup dip for 25p.
Me: (stunned silence).
Teller: No, we're out of ketchup. But you can buy ketchup dip for 25p.
Me: But I just want ketchup.
Teller: So you can buy the dip.
Me: But... but... DO YOU SEE WHERE I'M GOING WITH THIS??
Me: word