Train Juxtapositions

I was on the train today and couldn't help noticing the following things. Behind me, a physicist was having a conversation with a stranger about electron beams, solar flares and plasma weapons. In front of me I could see two women watching a film that may have been Dirty Dancing on a laptop computer. Overall this was an audio-visual combination I had not encountered before. I found one part of it much more interesting than the other...