- Access any subpage of a non-serviced tool on Tool Labs whose owner's name contains a space. In my case (and for the time being), let's say http://tools.wmflabs.org/pbbot/something (the displayed text starts with The URI you have requested, /pbbot/something, is not currently serviced.).
- Click on the link pointing to the maintainer's userpage in the line This URI is part of the pbbot tool, maintained by Peter Bowman.
- On wikitech: User account "Peter+Bowman" is not registered.
This kind of redirect would be valuable whenever something bad happens and I'd like to point visitors somewhere, but in my case it's broken.