Usually I cede the culture beat to our brother site 
Modern Fabulousity, but I heard this on Newsradio 88 this morning, and in the spirit of the Festival of Ridiculousness that is Oscar® weekend, I wanted to pass it on.
Out of 20 acting nods, at least seven, or 35%, are connected to fellow nominee Leonardo DiCaprio (a.k.a. The Actor Who For Some Reason Scares the Bejeezus Out of Straight Men in America):
Thread 1:Leonardo DiCaprio worked with Kate Winslet in 
Titanic.
Kate Winslet worked with Jim Carrey in 
Eternal Sunshine of the Spotless Mind.  Carrey worked with Morgan Freeman (nominated for 
Million Dollar Baby in 
Bruce Almighty.
Thread 2:Leonardo DiCaprio worked with Johnny Depp (nominated for 
Finding Neverland) in 
What's Eating Gilbert Grape.  
Johnny Depp's co-star in 
Finding Neverland is Kate Winslet.
Thread 3:Leonardo DiCaprio worked with nominee Hilary Swank (
Million Dollar Baby) in the 1980's television series 
Growing Pains.
I'll add a couple more:
Leonardo DiCaprio worked with Meryl Streep in 
Marvin's Room.  Meryl Streep worked with Clint Eastwood (nominated for 
Million Dollar Baby) in 
The Bridges of Madison County.
Leonardo DiCaprio worked with Ioan Gruffudd in 
Titanic.  Gruffudd appeared with Clive Owen (nominated for 
Closer) in 2004's 
King Arthur.
OK, now you try it.  Post your findings in the comments.