C172 PLT PERCEIVED THAT A LNDG ACFT ALMOST CRASHED. HE BECAME SO EMOTIONALLY SHAKEN UP BY THIS; HE PROCEEDED TO TAXI ONTO THE ACTIVE RWY WITHOUT CLRNC. HE THEN CUT OFF ANOTHER LNDG ACFT.

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WITH THE ATIS; MY FLYING PARTNER AND I CALLED GND CTL AND RECEIVED PERMISSION TO TAXI TO RWY 30 FOR DEP. AFTER RUN- UP; I TAXIED UP TO THE RWY BOUNDARY LINES AND CALLED THE TWR; 'READY FOR TKOF.' I READ BACK THE 'HOLD SHORT; LNDG TFC' INSTRUCTION FROM THE TWR AND HELD MY POS OFF THE RWY. AN APCHING C172; FROM ONE OF THE LCL BASE OPERATORS; MADE WHAT LOOKED LIKE AN UNSTABLE LNDG APCH. WITH UTTER AMAZEMENT; WE WATCHED AS THE C172 BOUNCED OFF THE RWY IN FRONT OF US; AND THEN PROCEEDED TO PORPOISE AND BOUNCE SEEMINGLY OUT OF CTL DOWN THE RWY; WITH NO OBSERVABLE ATTEMPT TO EXECUTE A GAR. WHEN THE C172 NEARED THE END OF THE RWY; WE WATCHED IN SHOCK AS THE ACFT ASSUMED A DANGEROUSLY HIGH UNSAFE NOSE UP ATTITUDE WITH ITS TAIL SECTION ABOUT 10 FT OFF THE RWY. AT THIS POINT; I PRESSED THE MIKE BUTTON AND CALLED OUT THE FOLLOWING WARNING ON TWR FREQ; 'PUSH THE NOSE DOWN; YOU ARE GOING TO STALL! PUSH THE NOSE DOWN; YOU ARE GOING TO CRASH!' AN ANSWER CAME BACK; 'WE ARE UNDER CTL; THERE IS AN INSTRUCTOR ON BOARD.' THE C172 THEN ASSUMED A MORE NORMAL ATTITUDE AS IT BARELY CLRED THE ROADWAY FENCE AT THE ARPT BOUNDARY; 400 FT PAST THE END OF THE RWY; OVERFLYING THE AUTOMOTIVE TFC ON THE ROADWAY AT AN ESTIMATED ALT OF LESS THAN 30 FT. AFTER JUST WITNESSING WHAT I BELIEVED HAD BEEN A NEAR ACCIDENT; I WAS TOTALLY DISTR FROM THE PROPER CTL OF MY OWN ACFT AND PROCEEDED TO MAKE MY OWN DANGEROUSLY UNSAFE MOVE. WITHOUT WAITING TO REGAIN MY COMPOSURE AND A SENSE OF WHAT WAS ACTUALLY GOING ON AROUND ME; SEEING THAT THE RWY WAS NOW CLR; AND WE WERE FIRST IN LINE; I PROCEEDED TO TAXI ONTO THE RWY AND HOLD POS FOR TKOF WITHOUT ACTUALLY RECEIVING SUCH INSTRUCTION FROM THE TWR. IN DOING SO; I CUT OFF A PIPER WARRIOR ON SHORT FINAL FOR LNDG ON THE SAME RWY. THE TWR IMMEDIATELY INSTRUCTED THE PIPER WARRIOR TO GO AROUND AND PROMPTLY INFORMED ME THAT I HAD TAXIED ONTO THE RWY WITHOUT PERMISSION; REMINDING ME THAT THE INSTRUCTION HAD BEEN TO 'HOLD SHORT.' I IMMEDIATELY TURNED MY AIRPLANE AROUND AND TAXIED OFF THE RWY. THE PIPER WARRIOR HAD SUFFICIENT TIME TO MAKE THE GAR AT A SAFE ALT. WHEN BACK ON THE TXWY; CLR OF THE RWY; THE TWR THEN INSTRUCTED US TO 'TAXI INTO POS AND HOLD.' I READ BACK THE INSTRUCTION AND PROCEEDED TO DO SO. AS THE PIPER WARRIOR MADE HIS CLBOUT ON THE GAR; THE TWR CLRED US FOR TKOF. WE PROCEEDED TO TKOF AND PROPERLY DEPART THE AREA WITHOUT FURTHER DISTR. AT FREQ CHANGE; THE TWR CTLR DID NOT SEEM TO BE UPSET BY WHAT HAD JUST OCCURRED.