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What connects the following fictional characters?

Luke Skywalker (Mark Hamill, Star Wars), Sheldon Cooper (Jim Parsons, The Big Bang Theory), Pheobe Buffay (Lisa Kudrow, Friends), Peter Barlow (Chris Gascoyne, Coronation Street)

Auditioned for a different role?

DavidC wrote: ↑22 May 2018, 20:19 Auditioned for a different role?

No, this is an attribute of the characters, nothing to do with the people who play them. I just added the actors for clarity.

Luke Skywalker is the one for whom this is most commonly known.

They all have twin sisters.

DrainBrain wrote: ↑23 May 2018, 22:01 They all have twin sisters.

Spot on - I would have accepted twins, but that is the precise answer.

What last occurred on 25 June 1987 and will not occur again for over 300 years?

GuyBarry wrote: ↑24 May 2018, 11:20 What last occurred on 25 June 1987 and will not occur again for over 300 years?

Is it the last time that the State Opening of Parliament, Wimbledon and an episode of Blackadder were shown on BBC1 on the same day?

Although, how would you know that won't happen again until 17 June 2345?

michael_churchill wrote: ↑24 May 2018, 15:55 Although, how would you know that won't happen again until 17 June 2345?

Oh, very good. Now I know you've got the right answer but I'll let someone else give it.

Eight different digits for DD/MM/YYYY

Correct!

What notorious April Fool took place in June?

The Normandy Landings? Apologies if this is rather too serious and sombre a response to the question.

I can see your thinking with that one, but this was one of the "spaghetti trees" variety.

No other takers? It's a one-off TV programme from June 1977. There's quite a lot on the internet about it.

Found it! Alternative 3