In case you didn't see it: One of the engines on a United Airlines flight out of Denver on Saturday EXPLODED shortly after takeoff. Most of it stayed intact long enough for the pilots to turn back and land safely. No one was injured.
One of the passengers filmed the damaged engine after the explosion, and you can see flames inside it. Parts of the engine fell on a neighborhood below. Luckily, no one was injured on the ground either.
Here's the passenger's video of the engine. You can hear eyewitness accounts from some of the passengers, here. And here's audio of the pilots issuing a mayday call.