We don't have so much of the nonsense chatter any more. We sometimes get the nonsense questions but not to the extent we used too. I thought I'd share some ways that helps us.
Our kids generally have a lot of anxiety in the car. I assume it is because they were moved so much and it brings up the "Where are they taking me?" feelings of long ago. So the questions would start firing. We have a "No questions in the car" rule. So when they say "When we get home can I go outside? What is for dinner? Why is that man limping?" I simply said "No questions in the car?" If that did not stop them I'd say "If you ask me in the car the answer will be the opposite of what you want. Would you like for me to go ahead and answer or do you want to wait until we get home?" If you do feel they are having anxiety I think it is good to play soothing music, happy music and sing. That would improve the mood or cause them to quiet at least. I only have a "Mom voice" when it comes to singing but it has always had a very calming effect on them. I think it is because when they first came at ages 3 and 6 I sang to them and roked them every night.
One of the boys was SO caught up in asking questions morning to night we had to limit him to 8 questions a day. That is how many we would answer. So it went something like this:
"Why is that car green?"
"The person must like green cars. That is 1 question."
After 8 questions we'd say "I'm sorry you are out of questions for today. Ask tomorrow."
It was not long before he'd say "Why.....wait. I dont want to waste a question on that."
"Way to think things through kiddo. Great job"
Nonsense questions get nonsense answers. So when dad walks past and Bear says "Hi dad", Dad says hi as he is walking up the stairs. Then Bear would say "Where is dad?" To which I'd reply "Down stairs". Bear would smile and say "Noooooooooooooo he is not." I'd just say "Oh."
Or if we are shopping and see a pair of pants and they say "What is that?" I'd say "A shirt." They always smiled because they always knew.
Don't make a big deal out of the questions. Dont' try to force them to tell you that they already know. Lighten up and move on. When they don't get attention for it they lose interest. Never, never, never quit!