Hm, I don't know... How does humerous funeral look like? It sounds more painful than normal funeral to those who are left behind. I mean, I just killed myself, my family is in real pain, and now they are supposed to take funny jokes and acting like it didn't have any negative effect on them when they are grieving? Forced smiles when your soul is telling you want to cry. I don't know anything about arranged humorous funeral, but I can assume they are working when you were a loving, humorous person when you were alive, then people will maybe 'get it', but not when you killed yourself. Suicide comes unexpected, it's different than other deaths to those who are left behind, so...
Hm... But I don't know actually. Maybe it can work. I just don't know anything about humerous funeral. And it depends what kind of person you are in real life. And depends what kind of people are your closest family and friends. In my case, it wouldn't work. Maybe you can write a really warm, empathetic letter about life and death and say they could read it in funeral (not a suicide a note, just letter to create mood) , so people will feel more peace and you can actually direct the mood of the funeral a little:D.
I'm getting nowhere with my answer. I was just thinking out loud. :P Good thread. :)