One day a scuba diver was enjoying the aquatic world 20 feet deep. He noticed a guy at the same depth he was, but he had on no scuba gear whatsoever.
The diver went 20 feet deeper, but the other guy joined him a few minutes later. The diver went down another 25 feet, but minutes later, the same guy was there too. Confused, the diver took out a waterproof chalk-and-board set, and wrote, "How 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 IDIOT!!!"