Catch a weasel asleep American phrase
To make a watful, or alert person feel surprised
I tried to make John, a former Navy, scared, yet I failed to catch a weasel asleep all time.
He is a vigilant person yet he looked dumbfounded when he saw me hold a fake gun. Yay! I caught a weasel asleep.
To be surprised by some sudden occurrence
To greatly surprise, shock, or confuse someone
The verb "catch" must be conjugated according to its tense.
The origin of this expression is not clear.
It was often said by a photographer when he would like small children to look at the camera and smile before he took a photo.
When the photographer said “watch the birdie”, all of us looked at the camera and smiled.