this past week I learned a new (and only one) annoyance with my 38mm sport. I was teach a class and several times while I was standing I crossed my arms. I wear the watch on my left wrist and when I cross my arms my left wrist is the one that gets tucked under. Well, the motion of crossing my arms activates the screen. Then when I settle into the crossed position, my right forearm apparently applies enough pressure to the screen and it kept going into the change watchface mode. Very annoying when you're giving a presentation and have a timer going and it keeps backing out of the watchface. Just something I noticed.