We don't have a thread for "Random happy interactions with unknown kids" so this is here: I was on a train the other day. We pulled out of the station at exactly the same time as another train on a neighbouring platform (there are 15 platforms and a series of junctions and switches immediately outside the station). The two trains were side by side, then as they both switched tracks, the one I was on started to pull ahead of the other one. As the carriage windows passed by, there sitting at one was a little boy with his mother, both waving at my train. Boy had a big smile, mum a small one. So I waved back. Boy's grin threatened to crack the window! Then they disappeared as my train pulled ahead, before they overtook again and the process repeated. I imagine he carried on waving all the way to Cardiff.