I thought it was sad when SpongeBob got fired in the special "SpongeBob You're Fired". The poor sponge cried a lot and was really depressed to the extent of becoming a woobie. I can't tell you how tearjerking it was. I felt really bad for SpongeBob that I just wanted to hug him.
(Btw, if you do not know what woobie and tearjerking mean, look it up on tvtropes.org.)
When you think about it, the episode "Gone" was pretty sad because everyone celebrated a cruel holiday dedicated to getting away from SpongeBob, forgetting all of the selfless things he has done. I also found it sad when Squidward cried in "Enchanted Tikki Dreams".
Speaking of Squidward I found it sad when he did not care about SpongeBob one bit in "Whatever Happened To SpongeBob". The beginning of that special was also sad because everyone called SpongeBob an idiot boy and drove him out of town.
Edited on 06/16/2014 6:39pm