I usually reserve my "legal signature method" for those deliveries where I have had a negative driver follow up.
I once had a delivery to a house where the front door was open. I rang the doorbell and knocked as a courtesy was going to hand the package to the recipient. No one would come to the door. I looked in and could see someone at the other end of the house, but they wouldn't come to the door. I set the package down and sheeted as MCW.
A couple of weeks later I get a DFU for that address. On the 3rd attempt to work the DFU, a man answers the door. I explain why I am there, and the guy starts laughing. He says he didn't receive the package and that no women live at that address. He tells me I can't prove I delivered the package. No problem, I say, just sign here stating you didn't recieve the package. He signs, all the while still laughing.
A couple of months later, he gets a package. Supposedly, a negative DFU is supposed to flag the delivery address as signature only. It didn't, so I require a signature before I will deliver the package. On the 3rd attempt, he's home.
I tell him I need a signature. He scribbles on the DIAD. I erase his scribble and tell him he needs to sign again, but this time it needs to be legible. His facial expression changes and I can tell he's kinda starting to get angry. He signs. I ask him to spell his last name. He glares at me but he spells his last name. I then ask to see his drivers license to verify he is actually the name that he has just signed. This time his eyes bulge out and he is obviously very angry, but he shows me his DL. I hand him the package, say thank you and walk back to the truck. He hasn't had another delivery since then.
I can usually get a laugh out of just about anything and I like to play "fun and games" just like everyone else, but there are times where I am dead serious about my job. A negative DFU is one of them.