Is it physically possible...??

[coolahan 10+ year member]

the kid probably opened up the fuse distrib and it fell out without him noticing

 

[helotaxi 5,000+ posts]

Do you have a cap? I played my system in HS for a few minutes of a half farad cap to discharge it.

 

[killahbean 10+ year member]

too much drugs and alcohol!!!

 

[Rawr-DQ 10+ year member]

The closest thing to this that I've seen is when we installed Denim's Eclipse in the Brabus...**** thing was turning on with no ground wire attached. I still don't know how it did that, can't come up with a good explanation for it.
Did you measure infinite resistance between the positive terminal on the amp and the positive lug on the battery? Otherwise, this is all hearsay and speculation...

Obviously it was touching the car's body somehow, and completing the circuit...There are amps out there (not sure how many if not all) that are grounded to the negative terminal, which makes it possible to power on, if the positive side is hooked up, and the amp is not isolated (sitting on rubber, not touching any conductors) from the body of the car.