Willow: I mean, this time, it’s not your boyfriend who’s the cold-blooded… (Oz walks in) Jelly doughnut?

…

(later in the episode)

Giles: Our task now is to determine what sort of killer we *are* dealing with. Clearly, we’re looking for a depraved, sadistic animal.

Oz: (entering) Present. (Willow rushes over to him) Hey, I may be a cold-blooded jelly doughnut, but my timing is impeccable.

Buffy the Vampire Slayer – Season 3: Episode 4 – “Beauty and the Beasts”