B737-400 CAPT RPTS WATER DAMAGE CAUSED BY COCKPIT WINDOW LEFT OPEN OVERNIGHT BY GND PERSONNEL ENGAGED IN UNPROFESSIONAL PRACTICES. FURTHER EVIDENCE OF ACFT EQUIP BEING USED FOR PERSONAL USES DISCOVERED IN CABIN.

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THIS MORNING; I ARRIVED AT THE TOP OF THE JETWAY FOR FLT DEPARTING SFO; AND IMMEDIATELY HEARD A LCL RADIO STATION. THE CLOSER TO THE ACFT; THE LOUDER IT GOT. AS I REACHED THE COCKPIT THE VOLUME WAS BOOMING. SOMEONE HAD BEEN SITTING IN THE CAPT'S CHAIR AND LISTENING TO LCL STATION ON THE OVERHEAD SPEAKER AT A VOLUME LEVEL THAT WOULD HAVE HAD A HEARING IMPAIRED INDIVIDUAL COVERING THEIR EARS. THE CAPT'S WINDOW WAS WIDE OPEN AND RAIN HAD SOAKED THE SEAT CUSHION; HAND MIKE; OXYGEN MASK; AND FLOODED THE COCKPIT FLOOR. OBVIOUSLY SOMEONE HAD BEEN 'PLAYING PLT' OVERNIGHT. AT THE FORWARD FLT ATTENDANT STATION SOMEONE LEFT A CASSETTE TAPE JUST BELOW THE MUSIC TAPE PLAYER. OBVIOUSLY THE COMPANY CASSETTE HAD BEEN REPLACED WITH SOMEONE'S PERSONAL SELECTION. ALL THAT WAS MISSING WERE THE EMPTY BOTTLES AND FULL ASHTRAYS. I'M JUST SORRY THAT I MISSED THE PARTY. IT MUST HAVE BEEN A GOOD ONE. MAYBE IT IS TIME TO LOCK THE COCKPIT DOORS AT NIGHT TO KEEP THE PESTS OUT. AND WHILE WE'RE AT IT -- CHANGE THE COMBINATION ON THE TAPE PLAYER DOOR. PARTYING IT UP IN THE CABIN IS NOT A HUGE PROB. PEOPLE SCREWING AROUND IN OUR COCKPITS IS. THIS NEEDS TO BE TAKEN CARE OF IMMEDIATELY.