I once tried to pick up a girl in a bar using my "standard line", but had to switch to my "alternate line" after she shot me down.
I threw a line from the ship to the lifeboat, but forgot to fasten my end. I had to then throw an "alternate line".
Relevant to electricity:
I ran 2awg wire for the line side of my 400A service, and after it vaporized, I had to run an "alternate line".
OK, OK, red flag this after you've had your chuckle...