10) The duct tape that connects your hose to the first stage is starting to look a little frayed.
Mike Roberts of Kihei, Hawaii

9) You had split fins years before they were invented.
Kevin S. of Toronto, Ont.

8) You notice a very familiar-looking gear bag floating off into the distance as the boat pulls away at 40 knots.
Stephen Cumberworth of Oklahoma City, Okla.

7) Your wetsuit has bell-bottoms and lapels extending out to your shoulders.
Jim Ice of Los Angeles, Calif.

6) You see a regulator just like yours on the "Antiques Road Show."
Jim Mix of Deltona, Fla.

5) Your regulator has a single-digit serial number.
John S. of Germantown, Ill.

4) The other divers on the boat start humming James Bond movie themes whenever you gear up.
Ed Mabe of Orlando, Fla.

3) Your dive computer is only PC-compatible with DOS 2.0 or Tandy systems.
Stephen Cumberworth of Oklahoma City, Okla.

2) The Smithsonian has placed a respectable bid on your helmet.
Christina Kiang-Booth of Brooklyn, N.Y.

1) Your depth gauge measures in leagues.
Danny Luedke of Seattle, Wash.