Keep Your Shirt On!

The other day Isabel was trying to get Pop to fix her something to drink. Well, Pop was busy doing other things.
Isabel kept on following him around the house, nagging him,
"fix me something to DRINK!" .
Finally, Pop said, "Isabel just keep your shirt on!"
Isabel's response, "but Papa, I don't have a shirt on."
Me and Pop both looked at each other and just started cracking up. We couldn't argue with her, because as we looked at her, she had NO shirt on.
Silly Papa what was he thinking?