Before social media and water-cooler chats, people would gather around the tea trolly, with only three or four channels to choose from. Then, with grumbles about the weather exhausted, talk turned to their previous night's viewing. Millions stayed up to watch Apollo 11 land on the moon in 1968 or gasped in shock as Den waited until Christmas Day to drop the divorce bombshell on Angie. So here, in no particular order, are my top 25 TV shows of the 20th century.
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