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The last time we looked, that big box on the Twitter homepage says "What are you doing?" Maybe it changes at 9.55pm on a Wednesday night to say "Why not tell the entire planet who's been fired on The Apprentice?", or maybe Americans get a special version that says "Quick, tell the Brits who dies in Season Five of The Wire! It's not on there for months!"
Ruining it for the rest of us
Whatever the reason, Twitter users are ruining TV for those of us with better things to do than to watch entire box sets on the day of release, tune in the old-fashioned way to terrestrial broadcasts or move to the USA so we can watch Steve Carell in The Office.
Twitter isn't the only offender, but unlike others - newspaper reviews, work colleagues - it's instant. If you can't watch something at the same time as everyone else, you've still got all night before some sod spoils the ending for you.
With Twitter, you haven't. Recording a programme because you had to work late? Check Twitter on the bus home and your evening's buggered.
Pausing TV just before the end so you can make a quick cup of tea? Check your message while the teabags stew and you'll find yourself wanting to teabag certain Twitterers.
We understand it, we really do. We're the ones in the pub arguing over the best bits of In The Loop, analysing The Wire and shouting expletives at The Apprentice.
And we're not arguing that you should keep schtum forever: if you don't know how Citizen Kane ends by now, it's not really anyone's fault if you find out by accident.
But Tweeting isn't talking, it isn't blogging, it isn't reviewing and it doesn't wait for anyone else to catch up: if you give away the ending, your followers can't avoid it.
That means it's the equivalent of coming out of an early showing of The Empire Strikes Back in 1980, pulling out a megaphone and telling the queuing fans: "HOLY CRAP! DARTH VADER IS LUKE'S FATHER!"
We're warning you now. If you tweet the ending of Star Trek after next week's advance screenings, we're going to make your PC boldly go where no PC has gone before.