The funniest moment is, without a doubt, the moment Mr.2 visit their ship.
Luffy, Usopp, Chopper and Mr.2 just go STOOOOOOP JOKING AROUUUUUUND! lol
And I laugh a lot with Luffy and Chopper too. Luffy's hilarious, and Chopper can't hide his true feelings lol and he hides in the wrong side