Template:Invalid/doc
From Tardis Wiki, the free Doctor Who reference
{{Invalid/doc}} is a template that places a clear message at the top of pages that indicates the topic does is not derived from what this wiki considers a valid source.
To use, just type put {{Invalid/doc}} at the very top of the page, which will result in the following message:
Error creating thumbnail: Unable to save thumbnail to destination
Template classification
This template is deliberately classed as "unknown".
