I've been to three:

First was my grandpa's girlfriend when I was 9 (closer than a grandma to me)
Second was a grandpa's friend's wife when I was 14
Third was a best friend who shot himself in the head (suicide) when I was 18.

The friend's funeral was completely depressing. He was actually a very happy person (around us) and atheist, yet his parents played all heavy organ depressing music.

I want fucking rock 'n roll at my funeral, dressed in t shirt and shorts, and have someone perform "The Great Gig In The Sky" while every toker in the room lights up. Taco Bell and cereal will be served at the wake. I will be put into a tissue digesting machine and be made into compost for a tree. A beech tree.

That would be a damn good funeral.