Cat Got Your Tongue?(can't talk?)
Come on, Connie! Tell us what you think about our little ride down the rapids yesterday.
well, uh....
Wasn't it exciting?
I, uh..,
What's the matter? Cat got your tongue?
If you must know, I'm keeping quiet because I was scared out of my wits!
be scared out of one's wits = 恐ろしくて震え上がる
out of one's wits = 動転して be at one's wits end = 困り果てる