Here's a video that's gonna make you feel old, especially if you're older than 25. In this video, a confused little kid sees a pay phone for the first time.  He's about eight, and has no idea what he's looking at.  Eventually he asks if it's an "old-fashioned" phone, and his mom can't stop laughing at him.

The kid does have a point, I can't remember the last time I saw a pay phone. I think it was about 10 years ago at the mall.