Since many people fall in love over a bottle of wine, it must be a love potion.
door knob (mine just happened to be an old porcelain one)
cork (#6 for soda bottles)
StazOn ink pad
clear spray paint
sand paper (optional)
wire brush (optional)
Clean the shank on the door knob with sandpaper and a wire brush. Spray with clear spray paint to prevent rust. Wet the cork and squeeze a tiny bit of Gorilla Glue on the end of the door knob shank.
Clamp together for an hour or two. Remove from clamp.
Use rub ons, rubber stamps with StazOn ink and/or a permanent marker to write your message on the door knob. Spray with clear spray paint to protect the label.