Because I think every child star suffers through this period because you're not the cute and charming child that you were. You start to grow, and they want to keep you little forever.
Even if the chef has a good business head, his focus should be behind kitchen doors. A business partner should take care of everything in front of the kitchen doors.
There is a lot of rubbish written about toilet humour - people saying it is childish and pretending it is beneath them - but there is no doubting the effectiveness of a really good willy gag.

