Water balloons are Calvin's favorite summertime weapon, much like he favors snowballs during winter. His most common targets are Susie and Hobbes. During the summer, he often has water balloon fights with Hobbes, or else makes plans with Hobbes to attack Susie. (These plans oftentimes fail.) Susie seems to have learned to expect this , as she is seen in one strip with a raincoat and umbrella on, as Calvin prepares to throw a water balloon at her; to which he shouts, "YOU THINK YOU'RE SO SMART!"
Sometimes, Calvin has plans to attack other people; for example, in one strip he's hanging a water balloon from a tree. He then acknowledges that the string is too small and asks his dad how tall he is.
Calvin may also try to soak someone with style. Calvin once even tried hanging a water balloon on a branch with longer string so if he missed his target (Susie), it would be reusable. However, Susie sends the balloon back after it narrowly misses her, and Calvin is presumably unable to escape.
"It'll build character!"
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