"Potter, when I want nonsense shouted at me I shall give you a Babbling Beverage."
-- Professor Snape (OP32)
The Babbling Beverage is a potion that causes the target person to talk nonsense.
References from the canon
- In an effort to pass along a warning to Snape, Harry once shouted "He's got Padfoot in the place where it's hidden." Umbridge was listening so Snape pretended not to know that Padfoot was Sirius Black and implied Harry was "spouting nonsense" due to Babbling Beverage. But as soon as he left the room Snape contacted the Order at Grimmauld Place (OP32)
From the Web
"Babbling Beverage" on Harry Potter Wiki