My friend was given this t-shirt as a gift but nobody knows what it says.
He was wearing it in the street and somebody passing him thought it was hilarious.
Can anyone tell me what it says?

There is a picture of it here...
http://uk.profiles.yahoo.com/pumpkin0069

ichiban - it just means "the best".

Ok, thanks.
I was hoping it would be something amusingly insulting though.

but would anybody tell something in japanese what would also look great on a shirt?