Dealing with the loss of a loved one is never easy, and different people go about grieving differently.
It's hard not to feel like life absolutely, positively, stinks when someone close to you dies. Food doesn't taste the same. A beautiful day with perfect weather and a shining sun is a mockery. You could bury your face in a pillow and cry for hours and no one would hold it against you.
There are some people and families, however, that get through traumatic losses by injecting some levity into the situation or finding what's hilarious. Heck, there are tons of movie scenes, some of them more lewd than others, that manage to turn funerals into key comedic moments.