catch a weasel asleep

To surprise someone who is normally alert, shrewd, or on-guard. Primarily heard in US. You want to try to steal your transcript from the principal's office? You never catch a weasel asleep—and especially not that one!

Common Names:

Name	Pronounced	Usage
Allissa	ə-LIS-ə	English (Rare)
Zebedaios	-	Biblical Greek
Jean	[dʒi:n]
Gerardo	je-RAHR-do (Italian), he-RAHR-do (Spanish)	Italian, Spanish
Susanna	[su:'zænə]
Achilles	[ə'kili:z]