Title text:
I wanted to make the world's fastest yawl, so I made the aft sail bigger, but apparently that means it's not a yawl anymore! It's a real ketch-22.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3193/
kite rig
There actually exist some boats that use kites exclusively for wind propulsion. This is used to save fuel, and most of the propulsion comes from motors. The kite is controlled by a computer.
That example might also count as a mastless rig from the comic.
Some people have also added kite-style sails to traditional sailboats, but I don't know much about this.