I'm planning to wear a manic grin in the funeral home.
Why would you look happy at a funeral home?
It will make me look like the bad guy in the story.
Seems like you are just trying to make light of the situation. You should not make fun of the fact that a life was lost here.
It's a way of showing my lack of respect for my friend.
You should be more respectful at a funeral home, it's rude to look happy there.