Count Duckula, Season 1

Dimitri:
(the clock bats emerge for a daily dose of humour) Hey, Svistoslav, that reminds me... What's the difference between a Yak and a Bison?

Svistoslav:
I don't know, Dimitri. Tell me, what is the difference between a Yak and a Bison?

Dimitri:
You can't wash your hands and face in a Yak! (goes back into the clock laughing to himself)

Svistoslav:
(returning inside the clock) But you can't wash your hands and face in a Bison, either...