When the seat belt sign is on we can't serve tea or coffee as it could spill and burn someone etc...
So anyway a passanger asked a crew member for a coffee. The crew member then pointed to the seatbelt sign on the ceiling and said sorry we can't serve tea or coffee when the seatbelt sign is on as it is too bumpy etc. etc.
I don't think the pax understood english very well as he then proceeded to stand up and press the seat belt sign and hold his coffee cup up to it thinking that the coffee came out of the ceiling!!
So funny!