Australian Sceptics, page-72

Witches can speak about witchcraft until the cows come home, it doesn't help us one iota. What they need to do is make a claim (for example broomstick can fly) and demonstrate that it is real and isn't involving any trickery (eg. broomstick suspended on chicken wire). The burden of proof is on the person making a claim, as it always is and should be.