Why is the third hand on a watch called a second hand?

“I just got out of the hospital. I was in a speed-reading accident. I hit a book…”

“Once I tried to kill myself with a bungee cord. I kept almost dying.”

“Sorry... my mind was wandering... one time it went all the way to Venus and ord…”

“Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgott…”