banging my knee - maybe hitting it against the desk or the side of the bed or something. dropping my pencil - one or two times letting the pencil loose in his hand because he's distracted and nervous and mad pool of Jell-O - it's a brand name for a dessert made from pectin and gelatin, sweetened with syrups and fruit flavors. You make it with boiling water, then let it set in the refrigerator until it is chilled (but not frozen) and it's a cold, fruity, sweet, jelly-like dessert.
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