https://www.vox.com/culture/2017/4/24/14912316/zardulu-viral...
I could see this going either way; a mouse could probably be trained to do this for a viral video. On the other hand, you can see animals get mental diseases known to occur in humans sometimes as well; an obsessive-compulsive mouse is also plausible to me.
(A disturbing number of "Look at my dog/cat/whatever doing this funny thing!" videos appears to my eyes to be the dog/cat/whatever having a seizure, for instance.)
The gentleman behind the video talks about it here
https://www.bbc.co.uk/news/av/uk-england-bristol-47625284/mo...
> “I don't do animal fauxtography any more,” she told me offhandedly. “So, I've been talking about some of my pieces.”
What over purpose could be served by revealing the deception?