Surely you can't be serious...

Passengers witnessed an unusual situation Thursday when a Delta pilot got locked out of the cockpit mid-flight.

No cause for alarm though, since the co-pilot was at the controls and landed the plane safely in Las Vegas.

A passenger uploaded video to YouTube (below) showing the pilot talking to passengers while it all unfolded.

"That's our pilot, he just got locked out," Curry Russell said in the video. "We're going to land with the first officer. The pilot is in the back of the plane."

Delta spokeswoman Lindsay McDuff told Associated Press that commercial aircraft can be landed with one pilot, and Delta crews are trained for such situations.

Crew members said the cockpit door malfunctioned.