I blame it on my grandma.
When I was a kid, we lived outside of Colorado for almost a decade, so my visits with my favorite grandparent were far less frequent than either of us would have liked. Because of that, we giggled like little kids every time we saw one another.
Conversely, every time I would leave, she would cry.
I always blame my far-too-easily-shed tears on those moments. Every time she would start to cry, I found I couldn’t help myself but to join in. She’s been gone for over a decade now, and dangit, I still cry far too easily.