I think the hat was meant to be a tennis stick cover
Surely all of us dart players know what it feels like to be beaten by someone who picks the darts up for the first time and just play the game for a laugh. It hurts. They never play you again, or anyone else for that matter, so you don't get the chance to exact any sort of pathetic revenge.
So imagine my glee to beat Deborah at tennis whilst on Holiday. She used to practice and everything. She thinks she's dead good. I beat her on pure serve and volley 6 love. To top it all I've laid the old tennis bat down and I won't give her a chance to, erm, exact any sort of pathetic revenge :o)