Well, I looked and didn't see one. So here it is. Okay, most people probably know what happens but I'll explain anyway.
Firstly I'll ask a stupid or irrelevent question (must be OP) then the next person answers with their own made up answer. After they answer they must come up with another question, then the next person answers and so on. So, I'll start off:
Q: Where does Kuro get his glasses?
A: A glasses store…. <_<
Um… You were supposed to ask a question too, TTC.
Q: Why does Zeff's moustache go straight out?
A: Because he's a pervert
Q: Why does Zoro have three earrings?
A: his favorite number is three, so he wants everything in 3s
Q: why is sanjis left eye alway covered by his hair?
A: For no reason at all!
Q: Is Siam and Zoro's hair dyed, or freakishly natural?
EDIT: really stupid question, I know.
A. natural…long story :wacko:
Q. what do chopper and pikachu have in common?
A: Both cute and fuzzy mascots.
Q: Where does Sanji dry clean his suits?
He probably just presses them in a waffle iron.
How come Luffy's straw hat doesn't rot with all the seawater and humidity it experiences?
A: It ate the Dry Dry Fruit.
Q: Where did Shanks get his scars?
A: From a battle somewhere…
Q: Where did Arlong get his nose?
A: His mama
Q: Who taught Shanks to fight?
A: whoever gave him that scar
Q: is usopp and kaku related?
A: yes but they don't know it
Q: What happened to the strawhat crew's parents?
A: During the events in One Piece, they've all joined a self-help "My kids have run off to become pirates" group. Yasopp can frequently be seen helping the other parents by explaining what being a pirate is like. The other parents aren't happy with him.
Q: If he has a hook for one hand, how DOES Crocodile light his cigars?
A:Have someone else do it for him
Q: Hpw did Bon Clay become okama?
A: He took it from behind once too often.
Q: What shampoo/conditioner does Nico Robin swear by?
A: herbal essence 
Q: What is One Piece (as in the treasure not the anime)
A toilet seat
What is Kriegs favourite show?
The Sopranos.
Just how did the Square Sisters get their hair like that?
A: They stole Team Rocket's hairspray.
Q: Why does Jango look and dance like Michael Jackson?
Cause he is.
Why are mermen so strong?
Everyone knows how beautiful mermaids are, so there's a lot of competitive bodybuilding to win them!
Why do the characters' names seem to not have much relation with their ethnicity; notably, Sanji sounds like an Indian name, not a blonde caucasian's.
'Coz he's a cook and for the rest it's OP!
Who did Bellemere's haircut?
A: Herself, a razor, and a mirror. Never saw GI Jane? XD
Q: How come Luffy never has hat hair?
–Bevin
'Coz he is rubberman!
Why is Usopp like Pinnochio?
A: He lies so that his nose stays that way. He'd look boring with a normal nose.
Q: Why does Buggy call himself "Buggy the Clown" if he's so self-conscious about his nose?
A:coz he wants to be famous, so he needs a catchy title
Q:Why is chopper's nose blue?
A: Because he always has a cold
Q: What made Kobe have pink hair?
His cowardness!
Why does Captain Morgan have a Möve written on his chin?
A: Because it wouldn't be as cool if he had written it on his arm or something like that,
Q: Why do you never get to see the strawhat pirates in the bathroom ? 
A: There constipated 24/7
Q: Why didn't Luffy ever go to school?
A:Coz he was poor
Q:Why is Walpol's jaw metal-ized?
A: Cause his last jaw fell off and they had to replace it, just like a pirates hook. It happens all the time..
Q: Why isn't there a Hellpiea?
A: because the temperature will be to hot for Luffy, he can melt
Q: why Zoro's skin colour never tanned eventhough he is often do the sunbathing?
He's used to it!
How does Nami's tangerine never falls from Going Merry? How does it grow?
A: Water from the kitchen sink
Q: Why does Chopper prefer to be 2 feet tall when he can be 8 feet tall on command?
Because Chopper's a human wanna-be
How did Morgan get his axed-hand?
From the Axe-on-the-hand merchant
Q:What why did Buggy become a clown?
he was born and raised in the circus.
why does arlong wear the dumbest hats?
He made it himself with a sowing machine.
Who sold Morgan his funky pants?
guile (sp???) from street fighter
true or false: bellemere is a lesbian.
well, she is an unmarried woman living with two young girls. and has a mullet.
make your judgements.
why did shushu eat that key?
He was hungry…
Cuz 4KIDS said so :lol:
Where are the Gum Gum Trees
On Gum Gum Island
Which way did he (Dragon) go? :lol:
A: Two halls down and to the right.
Q: Why are Ussop's eyelashes sooo looong?
A: because he was originally a girl but had a sex change XD
Q: how did Mihawk and Shanks meet?
A: At the Fairground. Watching two animals make love.
Q: Why does Chopper look so damn adorable?
'Coz he has a blue nose!
Why does Sanji has such funny eyebrows?
If you spoiler me, I will eat you with tater tots.
