I think the main problem with searching for fediverse posts is not that they’re not indexed but the lack of a singular tag to append when you want to search for them. To search for reddit posts it was easy because you could put in your keywords and stick ‘reddit’ or ‘site:reddit.com’ onto the end, but now there’s too many domains to keep track of and you can’t rely on appending ‘lemmy’ pointing a search engine towards all Lemmy instances, let alone kbin/mbin instances.
Apart from family and my own number about the only one I can think of is the Reading Writing Hotline (1300 655506) due to the sheer amount of their radio ads I’ve heard over the years while driving around.
Even within family I’ve only got one left that actually works though - Dad hasn’t changed his mobile number since circa 2000 but Mum did at one point and I never remembered her new one.
There is indeed a video of this.
There’s also a video of someone trying a similar setup with a dirt bike, though those guys didn’t reverse the front teeth (did still steer ok, not sure how well it’d brake).