I've always liked odd things in general, and strange and unusual inventions in particular.
Here are a few favorites.
"Device for Waking Persons from Sleep"
"Gas Powered Pogo Stick"
A novel use of horsepower
One of the great patent drawings: "Voice Communication With a Local Entity"
A new application for a plant patent.
Patent title : Dianthus plant named 'WATERLOO SUNSET'
I presume the name for the plant comes from the song,since the same breeder patented a plant named "Ruby's Tuesday".