how to hang outside christmas lights without nails

"Hmm...... that's a tough one. I've never been faced with that problem before. Let me think for a moment...... Oh, I know! You can use suction cups! They're like little plastic cups that you can attach to the window and stick your lights onto. They're easy to use and won't damage your walls or windows. Just make sure to use a strong suction cup and not too many lights at once, or else they might fall off."