Starter drain the battery dead???

I've seen this a couple times back when I worked for a Chevy dealer.
I've also seen alternator's abd under hood lights draw. I also had one that the brake pedal would drop just enough when sitting to close the brake light switch and cause the brake lights to illuminate dimly and kill the battery.
Had a few new cutlass ciera's back in the seat that the ecm would kill a battery overnight.
I used to do a lot of electrical work when I was a mechanic. Most people were afraid of it.