Sounds like the time I was waiting for an oil delivery and saw the truck just as it was coming to my house. I turned away from the window and waited for the guy to park and get his gear together.
When I didn't hear anything I went to the door. No oil truck. I opened it and looked around - the guy was up the street - pouring oil into someone else's tank! He got the address wrong.
At least they had an oil tank! Don't laugh - it's happened - several hundred gallons of fuel oil in the basement would get me to pinging a bit.