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
Nunziatina	-	Italian
Belinda	bə-LIN-də	English
Christy	['kristi:]
Etele	-	Hungarian (Rare)
Jeanna	JEE-nə	English
Hecuba	-	Greek Mythology (Latinized)