If you kayak with a cap on and the kayak capsizes, whether or not the cap falls off depends on the cap size.
Cap Size Matters in Kayaking
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Explanation
Experiment
Explain Bear
Alright listen up, you dummy. So, like, if your tiny hat is too small for your fat head and you flip your kayak, that lid is gonna pop off. But if your head is smaller than the hat, it'll stay on.