Moral-inhibitor

A person that regardless of the time of the day or the circumstances, has the ability to make you do something stupid and against your high moral standards, without even trying!

"I can't go to the mall with you any more"

Moral-inhibitor "Why"

"I swam in the fountain, naked, and got arrested"

Moral-inhibitor "I didn't tell you to do it"

"Well no, but i just do stuff like that when I am around you"