"Portable Toilet" is the first Regular Show episode where I actually had to research what I was writing. I sent them a thank you message recently for getting back to me. The final line in the episode made my research somewhat moot, but it was still a really strange experience and a fun exercise.
I mean how often have you had to send emails to portable sanitation service companies to ask them about their work?
Also I learned stuff! Who knew that thing about screens being there to prevent flies from laying eggs? How fun is that fact?