BBC 2 did the ultimate throwback this weekend and aired two of Sir David Attenborough's Passion Project films from the 70s.
The first programme revisited was called A Blank On The Map. It was first broadcast back in 1971 and showed Sir David's expedition into the heart of unknown territory in New Guinea - they were in search of a previously uncontacted tribe known as the Biami.
And here's why viewers loved it.
1. Forget going out on a Saturday night - the programme made everyone's weekends.
If you aren't watching the old David Attenborough programs on now BBC you are missing TV as its finest. Such humility and intelligence
-- katwoman (@kk8591) May 7, 2016
Watching attenborough's passion projects 1971,totally engrossed #Attenborough90
-- rhian cartwright (@rhiancartwrigh2) May 7, 2016
This David Attenborough archive is extraordinary. What a legend. #Attenborough90
-- faye harland (@fayeharland) May 7, 2016
2. Although if you were heading out, it provided a brilliant new way to get ready.
Was going to put some music on to get ready to but a David Attenborough show has just come on, Might get ready to the sound of his voice ??
-- Becca Becca Becca (@Kohler721) May 7, 2016
3. The thing is, none of his documentaries are ever boring are they?
David Attenborough @BBCTwo now, he could paint a square and watch it dry for four hours and it would still be the greatest TV ever shown
-- talesfromme (@talesfromme) May 7, 2016
4. And in this film we saw them encounter some amazing wildlife and people.
"Tree kangaroos are clumsy creatures & always in danger of falling out their tree" #DavidAttenborough - blank on the map
-- Emily Stewart (@Emilystewart991) May 7, 2016
There were tree kangaroos, goura pigeons, an emerald green tree python - plus a group of tribal people never before seen by Europeans.
5. We've said it before and we'll say it again...
Wow. Young David Attenborough was *Hot*, wasn't he?
-- Marjorie (@Marjorie73) May 7, 2016
6. Plus, we always learn so much from him.
Watching David Attenborough on BBC2 explaining how a suspension bridge is built in Indonesian jungle from natural materials. Fascinating..
-- Rochester Bridge (@RochesterBridge) May 7, 2016
7. His narrating voice was obvs just as great back then too.
-- Monkey Bones (@iratesheep) May 7, 2016
8. It was interesting to watch something from so long ago.
-- Kirstin McEwan (@KirstinMcEwan) May 7, 2016
9. And we got to see some crazy things, like how they made this tent.
10. There was a kinda weird bit when they went into someone's house...
-- Anne Pugh (@AnnePugh) May 7, 2016
11. But mainly he was just being amazing.
Vintage David Attenborough - doing a great, profound speech to camera in Papua New Guinea with a fly walking on his face - what a pro!
-- Nell Barrie (@Nell_Barrie) May 7, 2016
12. At the end, the Sir David we know today talked about the making this Passion Project.
He admitted he had been very nervous about going into the uninhabited house they found.
Then he whacked out his journal and showed us how he recorded what they had seen inside.
So cool. We heart you David.