While installing Canon’s MX700 all-in-one printer on Windows, I spotted this for my collection of bad dialogs:

Hint: if you ask the user a question, it’s good to allow for more than one answer. Even if you close the dialog by clicking the x at top right, it still reboots the system.

I was also interested to see whether the printer works with Linux. Canon doesn’t offer Linux drivers. Nor does it seem keen to hear from customers about this:

The CAPTCHA test always presents 8 zeroes, which it then rejects as invalid.

I haven’t quite given up.  There are Linux drivers for the Pixma MP520 which are rumoured to work somewhat. When I have a moment I’ll give it a try.