Party Crashers:-

The host at a party was getting worried because there were too many people
and not enough refreshments.

She was sure that not all of these people had been invited but didn't know how
to tell which ones were the crashers.

Then her husband got an idea.

He turned to the crowd of guests and said "Will those who are from the
bride's side
of the family stand up please?" About twenty people stood.

Then he asked "Will those who are from the groom's side of the family
stand up as well?" About twenty-five people stood up.

Then he smiled and said, "Will all those who stood please leave. This
is a birthday party!"