Here is another old but good joke.
Little Johnny went to class one day and his Dallas Cowboy teacher asked each student what NFL team they were a fan of.
Little Johnny said that he was a fan of the mighty Houston Texans.
The teacher asked him why he was a Texans fan and he said, well my mom is a Texan fan and my dad is a Texan fan.
The teacher "wittily" replied, well what if you mom was a hooker and your dad was a drug addict?
Johnny replied, "well then I guess I would be a Cowboy fan".