I'm going to go out on a limb and say Aliens, but… I mean, it could be a hundred different shows.
This was, however, more true back when I was playing face to face.
These days, a lot of the 'quote banter' that used to suffuse our table talk has been replaced with posting relevant image memes in the Roll20 chat window. I love it, personally; nothing like having the nascent force user fighting the temptation of the dark side… and see a fellow player post a photoshopped Gollum clutching a jedi holocron to their chest. That's good stuff.