Re: SPOOPY LAB.
"Uh. This is a secret lab. You're in it." The idea that someone was out here while he was taking a dump really bothered him, and when something bothered Rick, he just went all out angry.
"'THE WALL GAVE WAY!'" he mocked, mirroring Ron's expression and accent in the most unflattering of ways. "'And I decided instead of staying out, I'd have myself a little looksie and poke at someone's GUN.'"
If he hadn't been in the shitter, Rick would have been impressed enough to see what else the guy would be interested in exploring. He needed a Morty, after all.