Scare Prank

A balloon and a sewing needle. A small pair of grubby mitts. Not to mention a tiny, yet devious, brain. Add the four ingredients together, and--

Mad Jack: It's not gonna work.
Army Dillo: Aww... *puts down the balloon and the sewing needle* Why not?
Mad Jack: I know you were trying to be silent and sneaky, but I could hear the rubber from a mile away.
Army Dillo: What did it sound like?
Mad Jack: *takes off his left glove, inflates it, and rubs it against his other hand* *deflates it*
Army Dillo: Oh I get it now.

But still, I added Army Dillo myself.

Donkey Kong Country and Donkey Kong 64 - Mostly Classic Rareware with minor help from 
Base (used as a reference) -