Well, I didn't exactly make them myself - they're actually RATO units I got from an Army surplus store. They're rockets that help boost big planes into the air.

Here, I'll fasten them around the bottom of the tree and insert the igniters and...if those damned birds will PLEASE stop adding guano to the RATO units! It could upset the delicate balance at liftoff.

Aw, tahellwidit. 10...9...8....