(I'll be) hanged if I know!

I have absolutely no idea! A: "How are you supposed to turn on this newfangled computer?" B: "Hanged if I know!" I'll be hanged if I know how to fill out these tax forms!

Common Names:

Name	Pronounced	Usage
Vitalijus	-	Lithuanian
Koos	KO:S	Dutch
Melany	MEL-ə-nee	English (Modern)
Sidonius	-	Late Roman
Ladislav	-	Czech, Slovak, Slovene, Croatian
Arn	AHRN	English