A kid comes in with his friend--they want to look at the microfilm for the newspaper on the day they were born.
Problem: one kid can't remember when his birthday is.
Kid 1: It's October 1999.
Kid 2: But what DAY?
Kid 1: Saturday!
Kid 2: No, the NUMBER.
Kid 1: October 1999. Saturday.
Me: Well, was it Saturday this year, or the year you were born?
Kid 1: It's always Saturday!
Eventually, we figured out it was October 19, 1999.