Before we had social media, Americans used bumper stickers to share their strongest and strangest views with people who didn’t necessarily care.
The medium back then was cars. Slap a belief on the rear end and go. If people agreed, they honked. If they disagreed, they honked. Drivers figured it out, usually without crashing.
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The one I'll always remember was on the back of a car driven by a fine looking babe. It read "Let go of my ears, I know what I'm doing."