I've been to a few I think.
The worst was one of my best friends' dad's. Her mother refused to let go after she saw the body, and she had to be led out of the church sobbing, and this was only when we were 10 or so.
Then was my great grandafather's funeral, I didn't know him well, so I was just an observer there also when I was about 11 or so.
And the third was another distint relation. Don't remember much of that one.