What Makes Luffy Fall From The SKy?

[FroozenBee]

I've been asking myself THE question for a whole week and I guess I'll have to wait for another week to find out.
So while waiting let's play the guessing game?
Pick one from below:
a) Iva-san use his/her big head to float the ship.. you know like a hot baloon..
b) Luffy has a hidden wind/power dial and use it to float the ship
c) Jimbei asked the fishes/sea monsters to propel the ship up the air
d) Make your own guess and make it good