git commit -m "$(w3m whatthecommit.com | head -n 1)"
What the Commit is a website that generates offbeat messages that may delight as Git commit messages.
git commit -m '...' is the command to commit pending changes with some log message that describes the change. Without -m '...', a text editor would open to write the message there.
w3m is a web browser that works in a terminal. We use it because it shows a web page content as plan text, so we don't need to parse HTML and get the generated message on the page.
With head -n 1 we get just the first line of the page content.
The entire w3m command is wrapped in a Command Substitution $(...), so that we can use its output inside the git commit -m '...'.
Requires w3m.