CHAGRINED PLT'S RPT OF A GEAR UP LNDG AFTER BEING AIRBORNE A FEW SECONDS.

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TWR CLRED ME FOR TKOF. TKOF POSITIVE RATE OF CLB -- BRAIN WAS ON AUTOMATIC AND GEAR UP AT ABOUT 20 FT AND AT THE EXACT SAME MOMENT; THE ONLY PAX DOOR POPPED OPEN. FIRST THOUGHT WAS TO FORGET IT AND CONTINUE TO TKI; A FEW MINS FLT. NEXT THOUGHT WAS GAR; LAND; AND LATCH THE DOOR. NEXT THOUGHT WAS GEE 5000 FT OF RWY LEFT; LAND; CLOSE THE DOOR; TAXI BACK; AND TKOF AGAIN. I CHOSE THE WRONG OPTION. I FORGOT I WAS ON AUTOMATIC AND RAISED THE GEAR. ALL THIS HAPPENED IN A VERY FEW SECONDS. I DOUBT IF I GOT OVER 20 FT IN THE AIR. I ADVISED TWR OF MY INTENTIONS AND PULLED PWR. TWR APPROVED. I REMEMBERED THE GEAR ABOUT THE SAME TIME TWR XMITTED 'NEGATIVE GEAR.' I SELECTED GEAR DOWN AND FULL PWR; ABOUT 1-2 SECONDS LATER THE TAIL TIEDOWN RING WAS DRAGGING. I CHOPPED PWR; MIXTURE; AND MASTER AND SETTLED IN TO THE RWY. GAVE HARD R RUDDER TO TRY TO BRING THE NOSE INTO THE WIND TO STAY ON THE RWY. SLID TO A STOP IN THE RWY; SHUT OFF THE FUEL AND TURNED OFF THE MAGS AND EXITED THE PLANE. WHAT I SHOULD HAVE DONE WAS GO ON HOME AND THE HECK WITH THE DOOR. WHAT A PRICE TO PAY FOR 10 MINS OF NOISE IF I WOULD HAVE GONE WITH OPTION #1. I HAVE HAD A NUMBER OF DOORS POP OPEN ON ME BEFORE OVER THE YRS AND NO PROBLEM. LOOKS LIKE I MOVE MY PEG FROM THE 'THOSE THAT WILL' TO 'THOSE THAT HAVE' SIDE OF THE BOARD.