What is the most heartwarming thing you’ve ever seen?

When my son and my dog would play.

It always warm my heart when I see a rough and tumble man taking care of a newborn

My first child bring born.

Jackets

My sister playing ukulele while her pet monkey dances to it.

Things like this:
[youtube=https://www.youtube.com/watch?v=UHvfwlgqj_k]