Mental hospital

A bloke is visiting his mother in a mental hopsital when in the same room he comes across a guy moving his arms around and making beeping noises.

"Excuse me", he asks him. "What on earth are you doing?"

"I'm driving my car!, says the guy excitedly. "Beep beep!"

"You're not in a car, you're in a mental hospital!"

A voice comes from the bed opposite. "Mate, shut up will you,

Spoiler:

he's giving me twenty quid a week to wash it."