On the episode with the salty spitoon, Patrick and Spongbob fake a fight.Patrick hits Spongebob and gives him a black eye.Then Spongebob looks at Patrick and sees him beating him self up.Spongebob smiles and the black eye is gone!He's a fast healer or this is a slip-up.

Editor's note: I said yes, even though I believe that cartoon slip-ups like this are trivial and done intentionally by the writers and/or artists of the show to keep interest from the viewers. Who wants to see a black-eyed SpongeBob the whole episode?