Ton-Tounge Toffee

Ton-Tounge Toffee is a product created by Fred and George Weasley for Weasleys' Wizard Wheezes. It enlarges the tounge of the person who eats it to an indefinite length (at least four feet).

Fred and George used Dudley to "test it out". Before returning to The Burrow by Floo Powder, Fred "accidentally" spilled some toffees onto the floor of the Dursleys' home. Dudley then ate a toffee Fred hadn't picked up, causing his tounge to grow. Uncle Vernon was so outraged at this that he flung several pieces of china at Mr. Weasley before letting him restore Dudley's tounge.

The twins tried to sneak some toffees into the Quidditch World Cup, but were caught by Mrs. Weasley's Summoning Charm.