Speaking of riddles, here's a few to add to Abygale's list.
A plane crashed. Every single person in the aircraft died. But two people survived. How?
A woman shoots her husband, then holds him underwater for five minutes. Next, she hangs him. Right after, they enjoy a lovely dinner. Explain.
A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?
What disappears as soon as you say its name?
How can the number four be half of five?
Number one I believe the two were a couple