A while back I was in Vegas. I don't gamble but some friends did, so I spent hours wandering the casino floors. With my product hat on, I could see so much to improve in the computer-driven games like slot machines. So many ideas for making things more fun.
What stopped me was watching faces. Most people on casino floors are not having fun. They looked miserable, desperate, compelled. I wasn't looking at play, but addiction. That's not something I wanted to make more of.