1. A severed head, or "as close as you're gonna get to being a head in a jar on Futurama".
2. An actual dildo that your girlfriend or widow can actually use.
Conceptual artist Mark Sturkenboom's 21 Grams (named after the supposed weight of a human soul) allows your family to keep 21 grams of your ashes inside a blown-glass dildo. According to Sturkenboom, "She is able to have an intimate night with her sweetheart again." That's nice, right? Nice.