Funny story. A while back I gave my elderly father an Apple Watch. I figured it would encourage him to stand once an hour and walk around, and the taptic notifications would help him if he didn't hear his phone go off. And also for the peace of mind should he fall and need EMS.
Anyway, I set it up for him one day and I'm hanging out at his apartment and he's getting along fine with it, learning how to view stocks, the pedometer and stand reminders and such, then all of a sudden becomes very concerned and shouts out, "the watch is telling me I'm not breathing!!!! I need help!!"
I had left on the breathe reminders and he panicked and thought his watch was telling him he'd stopped breathing temporarily! He was quite relived when I told him what it really meant.
I then promptly disabled that function on his watch.
Other than that little episode, he loves his Apple Watch.