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But sure enough, you seem to have had the same experience.
And I bet you: The dev is going to deny it, just to have a laugh. xD
It's a black rat with red eyes that appears in the moment between when you finish installing the toilet and when the toilet lid is closed. It's a 'blink and you'll miss it' thing so it's very rare for players to be able to get screenshots of it. Which is why it's attained near cryptid status among players :D
You don't need to do anything, it will go away on its own. Congratulations! You have now joined the ranks of the players who have Sighted the Toilet Rat!
(I'll admit to being mildly surprised there isn't an achievement for it but then again it is very random.)