Backers Baffling Bunnies A Vampire Trick.
You get a bunch of Jumbo Bic Cards.
Some With Bunnies, Some With Top Hats, Some are Double Sided with Top Hats on One Side and a Bunny on the other.
You also get one Top Hat Card with a slit in it and a bunny that comes out.
The instructions do not define the effect. Just steps to take to present the effect.
While perusing it, I have deducted that a stack of Top Hat Cards, change places with a stack of Rabbit Cards and then you make a mistake, a hat is where a bunny should be. But then a rabbit comes out of the hat.