One day, a diver was enjoying the aquatic world twenty feet below sea level. He noticed a guy at the same depth, but with no scuba gear whatsoever.
The diver went below another twenty feet, and the guy joined him a moment later. The diver went down even farther and the same guy was right behind him.
The confused diver took out out his waterproof chalkboard and wrote, "How the heck are you able to stay under this deep without equipment?"
The guy took the board and chalk, erased what the diver had written, and wrote, "I'm drowning, you freakin moron...!"