I love the cover to Flash #133 (1962). Flash thinks, "I got the strangest feeling I'm being turned into a puppet."
What exactly does that feel like? I had to emphasize how silly it is by creating my own version. He still thinks it, but he's wrong. What a goofball!
Check it out on Coveredblog.blogspot.com. Look at more covers while you're there. It's a great site.