1. What 'Beetlejuice' star was born “Michael Douglas” but changed his name to avoid confusion?

2. What actor did much of his own singing when he played Jim Morrison in Oliver Stone’s 'The Doors'?

3. What writer-director-star of 'The Monuments Men' is the only person ever nominated in six different Oscar feature categories?

4. What actor lost 63 pounds to play 'The Machinist' and gained 43 pounds to play the lead in 'American Hustle'?

5. Who worked with his younger brother Casey in 'Good Will Hunting' and 'Gone Baby Gone'?

What’s the "Kennection" between all five answers?