One day, a diver was enjoying the aquatic world 20 feet below sea level. He noticed a man at the same
depth he was, but he had on no scuba gear whatsoever.

The diver went below another 20 feet but the guy joined him a few minutes later. The diver went below
another 25 feet, but minutes later the same guy was there again.

This confused the diver, so he took out waterproof chalk and a chalk-board set, (work with me here)
and wrote, "How are you able to stay under this deep without equipment?"

The guy grabbed the board and chalk, frantically erased what the diver had previously written, and
scribbled...

"I'M DROWNING, YOU MORON!"