I now have two favorite examples of this.
#1--Several years ago while having a conversation about something that had been written by an older pastor concerning modesty and lust my 16 year old son asked,
"What would a 70 year old man know about lust?"
#2--This one was added yesterday. Pulling into a parking spot my 14 year old son looked at the open handicapped spots and asked,
"Do they give everyone a pass for the handicapped parking when they turn 50?