I write on the cheesy greeting card, fill it with cheese, and giv it to the rabbbit. The rabbit opens it, and somehow, falls out the Lament Configuration from Hellraiser. The rabbit eats the cheese whilst solving the puzzle box, unwittingly unleashing Pinhead and his Cenobite demons. They do horrible things to the rabbit with chains and S&M toys before Clive Barker shows up, looks at the card, becomes infuriated by the cheesiness and kills the rabbit for being such a prick. Then, Clive and the Cenobites dance a happy dance and disappear forever over a candy rainbow of bloody carnage, singing songs about Hitler and a giant hamster.
Next weapon: Einstein's theory of relativity.