Calvin was seen using a bungee cord (incorrectly spelled "Bungie cord" in the strip) in a single weekday strip (8/7 1990). He attempted to bungee jump out of the window from his room, but his mother had to climb up with a ladder to stop him. Calvin said, "Aw Mom, you act like I'm not even wearing a bungie cord!" It is unknown how Calvin got the bungee cord, as his parents probably wouldn't let him buy one.

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