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
Ciriaco	chee-ree-AH-ko (Italian), thee-ree-AH-ko (Spanish), see-ree-AH-ko (Latin American Spanish)	Italian, Spanish
Kara (1)	-	English
Deja	-	Various
Malcom	MAL-kəm	English
ĽUbomÍR	-	Slovak
Jonquil	JAHN-kwil	English (Rare)