At a party in a marquee, more and more people were coming in and the host hardly recognised anyone. So he clapped his hands for attention, and announced: “Let’s have some order. First, could everyone from the bride’s family please raise their hand?”
Some people put a hand up.
“Right,” said the host. “Now, could everybody from the groom’s family please raise their hand?”
When various others put their hands up, the host said “Okay – all of you who raised a hand, please leave. This is a birthday party.”