Do Watches Watch You?

I never understood why a watch is called a watch, but I've come up with some possible reasons

- you watch them
- other people watch you when you wear multiple ones (I don't get it, why is it so weird for me to wear my five favorite watches?)
- the watch face actually watches you (that's a creepy thought)
- which watch watches which? (not a reason, but fun to say)
- watch me watch this watch! (still not a reason)
- "Watcha lookin at?" "Your watch." "Oh." (I'm out of reasons, but I'm sure you noticed that)