Do you ever notice how often when you watch a movie, there is someone in it that was in one of the last 2 movies you have seen?  I have been noticing that lately.  
Not 100% of the time or anything but it feels like a high percentage considering how many actors there are out there.
Like here's what I'm talking about.  The last movie I saw was Reds.  It has John Malkovich who was in the movie I saw immediately before that, Burn After Reading.  Burn After Reading also fits my premise because 2 movies before that, I saw Secretariat which also has John Malkovich.  Secretariat fits because just before that I saw The Queen and both movies have James Cromwell.  Now in the middle there I saw For Whom The Bell Tolls.  That doesn't fit the pattern.  Watching movies from different eras is going to screw things up.
But the next movie I will see - because it is sitting on my coffee table - will be Let Me In.  It has Richard Jenkins who was also in Burn After Reading which I saw 2 movies ago.  
Get what I'm saying?  I notice this all the time.  I will watch a movie and there will be someone like, "Hey, I just saw them!"
It's not something I do on purpose.  It just happens.  Sometimes it is just some obscure supporting shleb.
As I say, it is nothing like 100% of the time.  But I wonder if it's 50.  I'll have to keep track.