Imagine the scene.
You’ve been saving up that box set for weeks. There are 9 episodes and you just can’t wait. Your friend comes round to watch with you and as you’re about to start, says – “Oh I thought we’d just watch episode 4 and 5”. Puzzled by the request, nonetheless you agree and about 15 minutes from the end of episode 5 as the heroine enters a spooky basement armed only with fetching knitwear and a flashlight, your friend leaps out of their seat and says: “I’ve got to go, otherwise I’ll get stuck in the traffic, you know how it can be, see ya!”