Happened to me today, and quite literally pee's me off.
I walk in a petrol station and talk to the counter girl:
Me: "Do you have a loo?"
Counter girl: "No"
Me: "Well, where do you go while your on
C.G: "In the staff loo"
Me: "Sooo you do have a loo? Can I use it please?"
C.G: "NO! It'a for staff only"
Me: "Listen jobsworth, think about this logically I need to pee. It's your loo or your floor, Now I know how to flush a chain, but I don't know where you keep your mop"
C.G: "just round the corner there..."
C'mon people, get a grip! It's a freaking loo.