The world was waiting for this: Dadjokes on Nextcloud Talk!
Copy dadjoke.sh to your server and follow this guide: https://github.com/nextcloud/spreed/blob/master/docs/commands.md
Run this command to initialize your new /dadjoke
command:
sudo -u www-data php occ talk:command:add dadjoke dadjoke "/path/to/your/directory/dadjoke.sh \"{ARGUMENTS_DOUBLEQUOTE_ESCAPED}\" " 2 3
Enter /dadjoke
for a random dadjoke.
Enter /dadjoke [and your topic]
to laugh about something specific.
Enter /dadjoke --help
for help.
Credit for jokes: https://icanhazdadjoke.com