I hate it when people just tell me the plot of a film or TV programme. And it's particularly endemic amongst viewers of soaps.
Do they really think they can convey the carefully thought-out plot, dialogue, acting and scenery and do it justice.
By all means, please talk about a film or programme. But don't just relay the plot.
For example, I had the two following conversations about Gravity before I saw it:
"Gravity is a great film. Sandra Bullock is in space and then this happens and this happens and this happens. And it ends up with such and such, and this happens. Oh and George Clooney does this and this. And at the end, such and such occurs."
Even if there are no spoilers, it's just basically dull.
Or alternatively:
"I'd really recommend you see Gravity. Sandra Bullock, in particular, gives a great performance - there are some interesting parallels with Sigorney playing Ripley in the Alien films. George Clooney's there too. He's great eye candy but I think Sandra was the more important role. The film has got some amazing visuals, it's beautiful to watch. Just go and see it."