Does anyone think there may be a curse on the movie The Dark Knight?

Just to make this clear, I am half joking. But, it is kinda weird that Heath Ledger died. And now Morgan Freeman got in a car accident, and is in serious condition. Plus the fact that for some reason, Christian Bale lost it and may or may not have aulted his own mother and sister! Is it all just random coincidence, or is there more involved? Hmmmmmm.