There's always one

In a family that consists of more than two children, it seems as though there is always one clown in the bunch. This is the child who is constantly pestering the other children to the point where a fight becomes inevitable, who is always the one to get injured, who is always the one to attempt things that are completely outrageous, and who is quite frankly, the life of the party.
Time and time again you swear life would be simpler without this child, but when it comes right down to it, the family dynamic would be utterly boring without him/her.
Every child in my family seems to be quite rational, with the exception of this one child. We often wonder where he came from, and if we can send him back. BUT, honestly speaking, I can't imagine life without him.