Granted I've always been directionally challenged- but this was kind of ridiculous!
I usually go down a flight of stairs to grab a sandwich when I'm at work. The stairs are right in the open between our kitchen and mailroom- two places I go to several times a day.
In other words, you can't miss them.
So there I was with my wallet in hand, walking past one of my co-workers who was waiting for an elevator. I kept going toward who knows where- but it was a dead end.
Sadly, our elevators are slow- so I had to walk past him again after I figured out that was lost.
He said, "Ummm- are you lost?" (Probably thinking I was either very preoccupied or on drugs!). I had to admit that I was. I couldn't for the life of me remember how to get to those stairs. I just kept on walking until I remembered.
The floor I work on isn't that big, for Pete's sake!
There are most likely more embarrassing things that I've done- but this is the one that comes to mind.