Just for the heck of it go after hours and turn off your main breaker
with friends watching building.

I had a customewr at a local shopping mall they had electrical
troubles and found a connection from their meter powering public
spaces in the mall, seemingly left over from the malls construction in
the 60s. Tenants on that meter had been paying a big chunk of the
malls electric bill..

This was identified one night when the customer had a fire. The fire
department pulled the meter blacking out a big piece of the mall.

The mall claimed no knowledge I believe there was a lawsuit,,,,,,