A few years ago, I was returning from a business trip on AMTRAK. The guy across the table from me was reading Ender's Game....every person at work who has asked about the book has gotten more of an earful from me than they expected).
"Oh, I see you're reading Ender's Game. Do you like it?"
"I love it, it's a great book!" he said, without realizing what was about to happen.
"Ever wonder how the Battle School looks? Here, let me show you..." and I took out my computer and fired up the presentation. Poor bastard, he never even saw it coming. I think he's reading exclusively romance novels, now.