No, you arent crazy, it is real.

This easter egg can appear aprox every 5 new saved files (chances 1 of 5 to appear aprox)

Can be found between a pair of buildings in Uncanny Streets.

If you get too close, the toilet notices you, proceeds to spin and disappears.

Does it mean something? Like deep secret lore or something?
I dont think so, probably Ena having allucinations about the bathroom like someone on the desert searching for water lol

If you have any aditional info, feel free to comment!