It's been two days, and this thread as generated about as much interest as a dead hedgehog, so here's the answers:
1. They were all musical guests on the first season of 'Rowan And Martin's Laugh-In'.
2. They all made cameo appearances on the first season of 'Rowan And Martin's Laugh-In'.
3. They are all descriptions (made by either Dick Martin or Judy Carne) of the Flying Fickle Finger of Fate award on 'Rowan And Martin's Laugh-In'.
4. There was a lapse of at least ten years between the named film and its sequel: 'Mary Poppins' - 1964/'Mary Poppins Returns' - 2018; 'The Pink Panther'- 1964/'The Return of The Pink Panther' - 1975 (there were two Inspector Clouseau films intervening, but they didn't feature the Pink Panther diamond, so they don't qualify as 'sequels'); 'Toy Story 2' - 1999/'Toy Story 3' - 2010; 'Psycho' - 1960/'Psycho II' - 1983; 'The Texas Chainsaw Massacre' - 1974/'The Texas Chainsaw Massacre 2' - 1986.
5. All items named were the 'last' in specific categories:
-'Cars' was the last film for which Paul Newman received an acting credit during his lifetime.
-John F. Kennedy was (as of this writing) the last American president to be assassinated.
-'The Tempest' was the last play to be solely authored by William Shakespeare.
-'Schindler's List' was (as of this writing) the last film for which John Williams won an Academy Award.
-Frederick Sanger was (again, as of this writing) the last person to win multiple Nobel Prizes.
Boru
1. They were all musical guests on the first season of 'Rowan And Martin's Laugh-In'.
2. They all made cameo appearances on the first season of 'Rowan And Martin's Laugh-In'.
3. They are all descriptions (made by either Dick Martin or Judy Carne) of the Flying Fickle Finger of Fate award on 'Rowan And Martin's Laugh-In'.
4. There was a lapse of at least ten years between the named film and its sequel: 'Mary Poppins' - 1964/'Mary Poppins Returns' - 2018; 'The Pink Panther'- 1964/'The Return of The Pink Panther' - 1975 (there were two Inspector Clouseau films intervening, but they didn't feature the Pink Panther diamond, so they don't qualify as 'sequels'); 'Toy Story 2' - 1999/'Toy Story 3' - 2010; 'Psycho' - 1960/'Psycho II' - 1983; 'The Texas Chainsaw Massacre' - 1974/'The Texas Chainsaw Massacre 2' - 1986.
5. All items named were the 'last' in specific categories:
-'Cars' was the last film for which Paul Newman received an acting credit during his lifetime.
-John F. Kennedy was (as of this writing) the last American president to be assassinated.
-'The Tempest' was the last play to be solely authored by William Shakespeare.
-'Schindler's List' was (as of this writing) the last film for which John Williams won an Academy Award.
-Frederick Sanger was (again, as of this writing) the last person to win multiple Nobel Prizes.
Boru
‘I can’t be having with this.’ - Esmeralda Weatherwax