Mt. Rushmore of Movie Plot Holes

When you watch a movie, willful suspension of disbelief is your friend. There are a lot of things that happen which maybe don't make complete sense, but you're willing to let it slide if the film is good. But sometimes there are plot holes so gaping that you just cant ignore them. This week we're talking about plot holes from some of our favorite films of all time. Things that make you scratch your head and say "why didn't someone catch that before the movie was made?"