Director: OK, for this scene you are goimg to grab your ass, and sqeeze your cheeks to mimick you ass crack as a mouth. The butt is its own character, and your gave is going to play good cop as you try to get answers.

If you are a gen Xer, you probably know this movie. 

 Let me ass you a question  

 Can't believe this bit is only like 3 seconds long; it's seared into my memory!

https://youtu.be/Va2cxtPWMHg 

 Was it the director or an adlib from the actor?