not know A from a windmill

To be stupid. It references the vaguely similar shape of the letter A and a windmill. How do you manage to burn pasta? It's like you don't know A from a windmill.

Common Names:

Name	Pronounced	Usage
Yonit	-	Hebrew
Camryn	KAM-rin	English (Modern)
Pegasus	PEG-ə-səs (English)	Greek Mythology (Latinized)
Golshan	-	Persian
Billy	['bili]
Mallaidh	-	Irish