Is it normal to compulsively grit my teeth and tightly squint my eyes?

I do this many times a day, but I try to do it only when I'm sure no one will see, especially my wife and kids. It's especially pronounced and almost an unavoidable compulsion when I'm playing with my kids. I have found a trigger, and "cuteness" seems to be the biggest. Basically I can pick up my 2 year old girl and hug her and I just have this overwhelming explosion of love inside me that makes me grit my teeth as hard as I can and, (almost violently) squint my eyes so hard it begins to hurt. This isn't the only time I do it, I am a tier 3 remote technical support guy for a large .com and when someone asks what I feel is an incredibly stupid question, I do it there too out of anger.