Fred and Mary got married, but can't afford a honeymoon, so they go back to Fred's Mom and Dad's for their first night together.  In the morning, Little Johnny, Fred's little brother, gets up and has his breakfast.  As he is going out of the door to go to school, he asks his Mom if Fred and Mary are up yet.  She replies, "No".

Little Johnny asks, "Do you know what I think?"

His mom replies, "I don't want to hear what you think!  Just go to school."

Little Johnny comes home for lunch and asks his mom, "Are Fred and Mary up yet?"
She replies, "No."

Little Johnny says, "Do you know what I think?"

His mom replies, "Never mind what you think!  Eat your lunch and go back to school."

After school, Little Johnny comes home and asks again, "Are Fred and Mary up yet?"
His mom says, "No."

He asks, "Do you know what I think?"

His Mom replies, "Ok, now tell me what you think?"

He says: "Last night Fred came to my room for the Vaseline and I think I gave him my model airplane glue."