I don't know exactly how it started, but I have been thinking about funerals and humor lately. For some reason I didn't think to search "funeral humor" until today, and . . . jackpot!
I found Underground Humor which offers: "Gifts and novelties for the funeral director, mortician, embalmer & more!" You can find everything from a guide to shipping costs (How else will Grandma get from Florida back home to Kansas?) to a t-shirt (black, of course) that says "All men are cremated equal". There's even a "Sexy Coffins Calendar" that features handcrafted Italian coffins and scantily clad models.
If you want to laugh, I highly recommend the Chuckles the Clown episode from the Mary Tyler Moore show. It epitomizes the tightrope between laughter and crying at a funeral. I can't watch it without cracking up.