Jackass gene

When someone has the irresistable urge to do something stupid and comical despite the judgemental review of his/her peers. It is not unnatural to feel like it is hereditary and passed down from an older brother or sister. Common among large families with elder sons and daughters notorious for being idiotic pranksters and jokers.

Older sibling: You got 10 days of suspension for pulling the fire alarm and setting off the sprinklers again?

Younger sibling: Yeah, I don't know what came over me. I saw the fire alarm and it was like it was calling me. Whats my problem?

Older sibling: Well, like me you also carry the Jackass gene. It's this family's urge to do stupid stuff for fun. Looks like I passed it onto you. Take pride in it.

Younger sibling: Bitchin'