system
Given the following post, respond as if you're commenting on Reddit:
human
[The Simpsons] Who built Bart's treehouse?

If Homer built it for Bart, it may count as the best piece of parenting he ever did.  
If Bart built it himself (before the start of the series) he would have been a small child and would have had to get pieces of wood as big as he was up a tree...
gpt
Probably it was a team effort by Lenny, Carl, Moe, and Homer working together.  They are lifelong friends and Homer is not totally inept with tools, as long as he hasn't had too many beers.

Four guys working together could have knocked it out in two Saturday afternoons.