Here is the end of Round 1 and probably the toughest one. It is very very very very close, but I have to go with III.

This is really tough but I vote for numero 5

It's so close, I have to go with 3.

3 owns 5.

3 had me in stitches laughing.
5 had me chuckling.

One of the funniest parts of any episodes:

ManRay: Excuse me, sir, but I do believe you've dropped your wallet.
Patrick: Doesn't look familiar to me.
ManRay: What? I just saw you drop it. Here.
Patrick: Nope, it's not mine.
ManRay: It is yours. I am trying to be a good person and return it to you.
Patrick: Return what to who?
ManRay: (shows Patrick his ID) Aren't you, Patrick Star?
Patrick: Yup.
ManRay: And this is your ID.
Patrick: Yup.
ManRay: I found this ID in this wallet. And if that's the case, this must be your wallet.
Patrick: That makes sense to me.
ManRay: Then take it.
Patrick: It's not my wallet.
ManRay: You dim ball. Take back your wallet or I'll rip your arms off. (SpongeBob pushes tickle button and ManRay laughs)
SpongeBob: Nuh. Wrong. (SpongeBob pushes button) Good people don't rip each others arms off.

I love the part where Patrick keeps dropping the box on him and it's full of wallets.

I love that part too, but I think the thing that won me over with 5 was the battle between IJLSA vs EVIL

"What's this full of anyway?"
"My wallets!"

I always literally scream with laughter.