Bad Little Johnny

A salesman rang the doorbell and little Johnny answered. The salesman asked if his father was at home.
Johnny said, "Yes."
The salesman said, "Well, can I see him please?"
Johnny snickered and said, "No, he is in the shower."
Then the salesman asked if his mother was at home.
Johnny said, "Yes."
The salesman said, "Well can I see her?"
Johnny snickered again and said, "No, she's in the shower too."
The salesman then asked, "Do you think they will be out soon?"
Johnny laughed this time and said "No."
The salesman asked, "Why?"
"Well", Johnny said, "when my dad asked me for the Vaseline, I gave him some Super Glue."