I look at it, marvel over it, and move on. Seeing the occasional weird split - well, it happens. It's when I start seeing a number of them that I start to check out my regimen and see where (and possibly in the past, as well) I did something that caused major stress to my hair.
Damage can stay hidden for a while - so think back and see if you might have possibly done something to your hair a while ago, too.