Last night, Twitter and Facebook were awash with sadness because Tony Hart, a much-loved children's TV presenter, had died.
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He presented the BBC show Hartbeat from 1984 to 1993, which had what was, in retrospect, a very funky synthpop theme tune.
The only problem with this outpouring of grief is that he actually died in 2009, aged 83.
This person tweeted the bad news after seeing someone post it on Facebook.
#rip Tony Hart, a tv legend of my childhood.
When someone pointed out Hart died six years ago, like many, many others, he admitted he didn't check the date.
@Troodles80 yeah so I found out. Somebody posted it on FB and I never checked the date.
A great number of people have been sharing this Guardian article or this BBC one either without a) noticing the dates, or b) reading them at all.
This was one of several people who reminisced about sending Hart a drawing.
RIP Tony Hart - a real childhood hero even if my painting never got on TV
Even Americans were moved.
Awww. RIP Tony Hart. Even as a transplanted Yank, I know who he was and that he entertained and educated you lot.
For a time, it was the thing people were tweeting about.
People are currently posting six tweets per minute about their sadness over Tony Hart's death. He died in 2009.
Even Nadhim Zahawi, MP for Stratford-On-Avon, was taken in, retweeting this message of condolence.
The people who attended his funeral must have been slightly confused.
@jamesrbuk @jessbrammar @jimwaterson Wow. That's really bizarre. He died in Jan 2009 - I went to his funeral...
Hart's Plasticine sidekick, Morph, was moved to tweet that Hart was in fact already dead.
Over the past 24 hrs, many people on Twitter have reported that Tony Hart has recently died. Tony sadly died in 2009.
Someone mocked up this headstone for Hart, commemorating both his real death and his 2015 fake Twitter death.
RIP Tony Hart, who sadly passed away again this weekend. #tonyhart #morph
And now lots of people feel a bit silly.
So it turns out I'm the dickhead. Tony Hart died in 2009. Fuck the internet. Ha.
But the main thing is that people who grew up in the '70s, '80s, and '90s have really fond memories of Tony Hart and are sad that he's dead.
Even if he died six years ago.
Tony Hart meant so much to so many people that they forgot he already died. People be tits!