I first tried Windows Explorer but I could find no windows puns, probably because they are transparent...... even if I could find a pun, it might be to paneful to read.
Update these are not bars but vertical blinds
I did find a few One Liners.....
Sign on a music store window" "come in and pick out a drum- then beat it!
Some burglars are always looking for windows of opportunity.
The carpenter shuddered at the thought of exposed windows.
Found these on Puns and Jokes....