Have you ever been so nervous that you start saying or asking dumb things and forgetting your sense of mind?

The "Uh" "Um" "I dont know" "Huh" type responses or asking questions you know the answer to all from nervousness

Can't say that has happened to me but I've had that happen to others talking to me, it's kind of hilarious.

Probably yes but can't remember anything specific.

Yes!