What's that got to do with the price of fish?

A rhetorical question calling attention to a non-sequitur or irrelevant statement or suggestion made by another person. Primarily heard in UK. Yes, I agree that health care is an important issue, but what's that got to do with the price of fish? We're discussing tax incentives for local businesses—not exactly a related topic!

Common Names:

Name	Pronounced	Usage
Takhmaspa	-	Ancient Persian
Johanneke	yo-HAHN-nə-kə	Dutch
Naia	-	Basque
Chimwemwe	chim-WEM-way	Southern African, Chewa
Yahya	-	Arabic, Turkish, Persian
Young-Gi	yung-gee	Korean