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
Alexei	ah-lyek-SYAY (Russian), ah-leek-SYAY (Russian)	Russian, Ukrainian, Belarusian
Mariel	MER-ee-əl, MAR-ee-əl	English
Lucas	['lu:kəs]
Jarrod	['dʒa:rəd]
Ole	OL-e (Danish)	Danish, Norwegian
Marcellinus	-	Ancient Roman