checkmate

Semi-Exists: "Pat Hearts Squid" (S12). Basically, Squidward has to room with Patrick in his rock and they switch roles, with Squidward becoming Patrick and vice versa. The episode was a meh 5.5/10 and forgettable, however your idea might be good, if given a good writing team.

Also can't forget "Breath of a Fresh Squidward" (S5) where he gets shocked by the fence and becomes nice like SpongeBob. Another mid tier episode, though. 6/10.

yea