A horse's head going down the drain
When something is so ridiculous it might as well be a horse’s head being thrown in the sewer.
He said he’d become a superhero. I said, 'That’s a horse’s head going down the drain.'
She told me she could speak 10 languages. I said, 'That’s a horse’s head going down the drain.'
He tried to explain the universe. I said, 'That’s a horse’s head going down the drain.'