So far, the very end of Squidbob TP. The scene where everyone is fused together. That was very gross the first time I saw it.
There may very well be grosser episodes, but I haven't watched the show past season 4. I may have seen a handful of episodes from the next 5 seasons.

If you're gonna pretend to cut her hair, at least put some scissors in your hand!

I kinda think Squid Baby is disturbing

Squidbob tentaclepants
Everyone seems to remember that episode only for the final scene. Nothing else is notable really.

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no and blame the storyboard artists now the show. I don't have a worst favorite though i thought sb129-karate choppers was the worst season pairing.

he gets dissected?!?

What's there to clarify? He gets ripped apart or shredded in almost all of his episodes lol
Extreme Spots
episode in particular.
all deroy yor appne e la ng do.

clarify please.

The scene where Spongebob is dissected. Not just once, mind you.
I'm not going to stop the wheel. I'm going to break the wheel.

nudibranches eat sponges.

A Pal for Gary is disturbing and completely and insultingly stupid. I'll give you a synopsis of each character.
Spongebob: Stole a pet, and blames Gary for trying to kill him.
Gary: Perfect as can be, except to Spongebob who thinks he's responsible for the pet trying to kill him and is punished by being brought to the Krusty Krab from now on.
Now, the BIG question: Who is the villain of the episode? If you picked Spongebob, then you are like 99.999999% of the people who watched this episode! (Note: the .000001% is Nickelodeon)
All we have to decide is what to do with the time that is given to us. -Gandalf- LOTR FOTR

Frankendoodle

"Fear of a Krabby Patty" is the most disturbing in my opinion. In it, SpongeBob makes so many Krabby Patties that it drives him insane and he has to see a psychiatrist (Plankton in disguise). Then we get a glimpse into his psyche, and that's pretty weird. Also, "Gone" is pretty similar - SpongeBob goes crazy when everyone's gone.

Boating Buddies. That one is another one of the spongebob stalker episodes, like squid's visit, which is also creepy. Just watch the episode and see Sb's face when Squidward sits next to him. It's just creepy and unsettling to watch.

The Splinter Episode.

I know! I don't get grossed out that easily, but good God!

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ITS NOT ABOUT SUICIDE!!!

One Coarse Meal is about Mr. Krabs driving plankton to suicide. Are You Happy Now has two suicide jokes.
I am Groot

you're first comment is correct; if it were about that topic it'd be called spongebob-suicide pants. The splinter was okay; ya gotta admit good storyboards.

One Coarse Meal has suicide for its plot.
I'm serious.
I think you mean Are You Happy Now.
You guys are overthinking. Just because those episodes contain suicide jokes/innuendoes doesn't mean they're "about" suicide.
I think the most disturbing episode was probably The Splinter - that was disgusting.
You remind me of a white crayon
totally useless.

I think you mean Are You Happy Now.

One Coarse Meal has suicide for its plot.
I'm serious.

Squid's Visit is just creepy.
I am Groot