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/
I wish I knew enough about sailing to know which of these is a joke