A pet shop owner sold a parrot claiming it could repeat whatever it heard. A man bought the parrot and spoke to it for weeks, but could not get it to speak. He brought it back to the shop to ask for a refund. The shopkeeper insists he was not lying.
A train rolls into the station exactly on time. The train is not full, but no one gets on. All trains that stop at the platform travel to the same destinations in the same order. Why didn’t anybody get on?