Horse has a carrot attached to his head.
Farmer: that sure is a nice horse ya got there!
Horse owner: bitch please!, that ain't no horse, what we got us here is a...
Farmer: a horse?
Horse owner: no that's not it,
Farmer: o I know, it's a horse!
Horse owner: nah! Not that either.
Farmer: are you sure—
Horse owner: I just remembered. Good sir, this here, is a unicorn!