Oh, please, Terry, don't sink to this level. She's writing kids books - she can't come close to your level of humor. Harry Potter will never match Rincewind, Sir Sam Vimes, or (and see my tag line) the Wee, Free Men.
I read the Potter books because my daughter does - but I've never gone back and read them again. Yours on the other hand, I'll read again and again - I catch something new each time, and always find myself laughing.
Now, hurry up and get Thud to the printers.
One word: Xanth.