I judge this rule valid.

The response is amusing, both because it combines two previous restrictions in an assertion that is either surreal or sexual in nature (depending on how you read 'coupling'), and because my first parsing of the sentence understood 'coupling' to refer to Steven Moffat's great sitcom of that name, which was a particularly funny thing to say about guinea pigs' preferences.

It has one rodent.

It mentions cheese, which is a dairy product such as cheese.

It asks a question dryly.

It does nothing to contradict the RRs or to demand the impossible.

Under the beach, the pavement.