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Off-topic TalkWhere overpaid, underworked S2000 owners waste the worst part of their days before the drive home. This forum is for general chit chat and discussions not covered by the other off-topic forums.
I can give you a solution, because something similar happened to me.
One day, I was parked outside my friend's house...with my windows down. My interior proximity alarm kept going off, but I clearly saw from inside the house that no one was screwing with the car.
Later on that evening, I climbed inside the car...and when hit the start button...this damn cat jumped from the soft top well into the passenger seat and then out the passenger window! Scarred the shit out of me...I thought at first it was a Gremilin or something. Good thing I didn't react to it...I probably would have shot myself in the leg!
I guess the cat found the soft top well mat pretty comfortable...with the sun beaming down on it's back while taking a nap.
So, S TWO K...you could have unknowingly picked up a passenger that day...if your windows were left down at any time. Either that...or someone is playing a trick on you. It would have been a better trick if the cat was ill tempered...and tore your seats up.