- "Ten years ago there had been lots of photographs full of what looked like a round, pink beach ball in lots of bobbly hats"
- —Description of Dudley as a baby
A beach-ball is a Muggle ball made of plastic and inflated with air, meant to be light and easily bounced and tossed about from one person to another.
Dudley Dursley was compared to a beach ball when he was a young baby, due to his rotundness.
- Harry Potter and the Deathly Hallows (First mentioned)