1. Your blind date ended up being your ex wife.

2. Your blind date ended up being your sister.

3. Your blind date is indeed blind.

4. You found out your girl friend was your long lost adopted sister.

5. You were having an affair with your bosses wife only to find that your boss is having an affair with your wife.

6. Your birth control pills somehow got switched with your viagra.

7. You and your buddies went to a strip club and found out that your mom was the main act.

8. You caught your parents fucking on your bed.

9. You found a dirty magazine under your roommates bed and some of the pages were stuck together.