Rhinoceros: Reading Log #17

Jean: True, I was not invited. That honor was denied me.. But in any case, I can assure you, that even if I had been invited, I would not have gone, because... What's going on? Whatever is it?

Waitress: Whatever is it?

Jean: Oh, a rhinoceros!

Waitress Oh, a rhinoceros!

Grocers wife: Oh, a rhinoceros! Quick, come and look; it's a rhinoceros!

Jean: It's rushing straight ahead, brushing up against the shop windows.

That part really kinda threw me off. Even though I was expecting a rhino is the story I didn't expect it like this. Why was it so random? Was this guy bored when he made the play? I'm guessing he was just being funny and being successful at it.