I once wore two different shoes.
This happened one winter morning in 2013. I thought walking felt a little weird, but I dismissed it.
The shoes were both clogs, so they slipped on the same way, but they were definitely different shoes.
Unfortunately I had a meeting with a furniture distributer that day at their offices, so I did my best to hide the issue by keeping my feet tucked under my chair.
I haven’t put my shoes on in the dark since!