Calvin, she is polite and diligent in her studies, and her imagination usually seems mild-mannered and civilized, consisting of games such as playing "house" or having tea parties with her stuffed animals. Her parents are referred to several times in the strip, but have not appeared other than one brief shot of her mother's legs while talking to Calvin. Susie is frequently the victim of Calvin's derision and plots, and is also often willing to retaliate when provoked. Most commonly, Susie will be the target of Calvin's water balloons or snowballs. Calvin often goes to great lengths to disgust or annoy Susie, as when founding his and Hobbes' club 'G.R.O.S.S.' (Get Rid Of Slimy GirlS) expressly to exclude her. Susie is Calvin's equal (and often superior) in cunning, often turning his plans into ignominious defeats. The two sometimes speak at their bus stop, where both usually become exasperated at each other; and at the lunch table at school, where Calvin deliberately grosses Susie out with fictitious descriptions of his lunch. Susie sometimes argues in academia's favor when Calvin says disparaging things about school, and on at least two occasions worries that Calvin's antics will affect her own academic progress. Watterson has said he suspects that Calvin and Susie may have a crush on each other, and that "this encourages Calvin to annoy her". This love/hate relationship is most obvious in a Valentine's Day strip in which Susie seems to appreciate "a hate mail valentine and a bunch of dead flowers", and Calvin rejoices inwardly when she retaliates. In another strip, Calvin calls Susie for help with homework, and she teases him that he missed "the melodious sound of [her] voice". During one series of strips Calvin modifies his "duplicator" to copy only his good side; this well-dressed, polite, and very-intelligent version of Calvin soon becomes besotted with Susie, and is mystified by her hostile reaction. Mr. Bun Mr. Bun is Susie's stuffed rabbit, which frequents her tea parties as a guest. Unlike Hobbes, Mr. Bun is never shown as a living character, and Hobbes once described Mr. Bun as "comatose". This is used for comedic effect occasionally, as when Susie, playing "House" with Calvin, attempts to use Mr. Bun as their baby child, only to have Calvin refuse to recognize him as a human infant—with the entire strip, including the rabbit, drawn in a realistic style à la Rex Morgan,