Mark: What is a bar mitzvah, anyways?
Brad: Well, when a Jewish boy turns 13, they say a whole bunch of prayers, and then eventually his family throws him a huge party, with lots of food and tons of presents.
Mark: Cool. You think if I start praying now, I could have a bar mitzvah?
Brad: Yeah, Mark, why don't you do that? Then tomorrow you can pray for a new brain.
Mark: I just hope I don't get yours.