Sebastian makes a balloon disappear very slowly and noisily

Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.

Sebastian immediately arrives at the idea of inflating a giant balloon and then making that disappear. However, instead of bursting the balloon, he decides to let go of it and make it fly away and deflate of its own accord, which is a lot slower and less effective. The balloon bounces around the garden while slowly farting out air like a giant whoopee cushion. Lasses awards his effort fourth place.

(Written by Karl Craven)