Nine Devil-san, there's a thread exactly like this one.
Here. Anyways,
The funniest moments of mine are always Chopper's; or at least related to him. It was hilarious when:
- Luffy imitated his face when Mr.2 visited their ship (lol even Chopper laughed)
- He can't hide his inner feelings! lol that's the funniest about him. Specially at the end of the Arabasta arc, when he was making that medicine.
- He always hides in the wrong side lol I alaways laugh when he does this.
Anyways, the most hilarious moment of One Piece is without a doubt when Mr.2, the funniest character in One Piece, visited their ship. STOOOOOOOOOP JOKING AROUUUUUUUUUUUUND lol
There were a bunch of other times I don't remember. And yeah, Gomu Gomu no Baka was hilarious too.