Is it illegal to put stickers on someone's car windows?

Someone pulled a prank on me, and I know who it is and I want to get revenge. My plan is to get a bunch of those annoying paper stickers and put them all over their windshield and windows. Then when they try to remove them all, the back half of the sticker will stay stuck on the window. Might sound extreme, but... show more Someone pulled a prank on me, and I know who it is and I want to get revenge. My plan is to get a bunch of those annoying paper stickers and put them all over their windshield and windows. Then when they try to remove them all, the back half of the sticker will stay stuck on the window. Might sound extreme, but believe me, they deserve it. So, is it legal?
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