For no reason at all, he wants his club to have a weapon of his own creation he calls a "Mazooka."
Me: What is that, exactly? What's it made of?
My son: Oh-- we just need two chainsaws, a torpedo, and a harpoon.
Me: (Big WTF!? look)
My husband: We're practically there! (followed by ducking his head under the table so he can laugh in secret)
The "secret silent laugh" gets a LOT of use at our house...