Urban Defense

Mandy: Ooh, that's a cool gun!
Nick: I know. I want a steampunk bazooka like that one.
Mandy: Wait... for what?
Nick: Urban defense, obviously.

Bucket List

Mom: You shouldn't have a bucket list, you're twelve.

Whiplash or Potato Chips

Nick:  You know, trampolines are a great way to get people exercising.  Let's change that potential energy into kinetic energy, everyone!  

Mandy:  You're gonna have to put that into layman's terms for all the non-geeky people.

Nick:  Okay, then let's change those potato chips into whiplash!

Mandy:  Whiplash?

Nick:  I assume the non-geeky people like adventure.