Q: Can a will literally written on a napkin actually be valid?

A: Yes! The only requirements for a holographic will to be valid are that 1) the material provisions of the will are in the testator’s hand-writing (the person writing the will) and that 2) the will is signed by the testator. In fact, per the probate code requirements, just about anything that can be written on could theoretically be proven to be a valid last will and testament in California.