a fart in a mitten
When you’re stuck in a tiny space and you bounce like a madman who just saw a pigeon steal his sandwich.
My little brother in the car during a 3-hour road trip, bouncing like he was on a trampoline.
A group of swimmers on a bus, squishing like sardines in a can.
My son in bed, bouncing like he was trying to shake a bedbug out of his ear.