Jumping for joy is the leading cause of sprained ankles in excitable people; sprained ankles are the leading cause of loss of excitability.

My aunt Irma was an excitable soul who nursed more than a few sprained ankles since 1971. That year, her enthusiasm for life jumped a few notches following eye surgery restoring her sensitivity to colors. I often wondered why she didn’t restrain her leaps, as her ankles were not made of the same stuff as those of kangaroos. To be sure, she wasn’t as massive as a kangaroo. Even is she had been, she’d have lacked that giant meaty tail for support.