The "Roadog"
"Bikes and Beards" is a (US) youtube channel known for some odd antics. Sean (Bikes and Beards) is friendly with Dale at "Wheels through Time" a Harley museum.
Sean buys Roadog and Dale get its running for them to ride.
https://www.rideapart.com/news/69253...-riding-video/
Here's Sean's channel (he's religious so there's a Bible verse somewhere in all his videos plus him trying to sell you stuff) he describes the bike's history and its creator (an aerospace engineer) plus more video of it being ridden.
https://www.youtube.com/watch?v=NHJ7PtgXSZE