I absolutely have this. I've had about 10-15 WHITE hairs show up in the past couple of months. This period of my life has had more stress than I've ever known... I'm starting to be able to manage it though so hopefully the gray stays away :) Honestly though I don't feel like it's a huge deal. I'm blonde anyway and it's not noticeable.
I haven't came across one yet. But, that doesn't mean I haven't experienced the stress to put them there!! I'm truly surprised I don't have a FULL head of gray hair:smileyhappy: