The other day, I was waiting in line at the grocery store, and I noticed that the guy in front of me was buying all health food. Organic juice, fruits and veggies, etc. I was impressed. Then as he was about to check out, he asked the cashier for a pack of Marlboros. I stopped myself from laughing out loud. And since I couldn't think of anything tactful to say, I kept my mouth shut. Now, you have to understand that wasn't easy for me.
After the guy was a safe distance away and half of my stuff was already bagged, I said to the cashier, with a big laugh: "What's up with that guy buying all health food and then getting cigarettes?? That doesn't make any sense!" This started a funny conversation between myself and the cashier, which lasted until it was time for me to go.
I'm curious: Do you do that? Do you talk to cashiers or other customers? Give me an example of what your usual check-out experience looks like.