This is a drum kit added as a sidecar to a BMW motorcycle. It showed up at the Drummer’s Database’s FB Page, but we don’t know yet who the author is, and we would love to give proper credit! Another take on a similar idea was done in Russia by these guys:
This is so cool. Now I just need a bike and a drumkit.
Also, if you want to see more geeky & weird bikes, you may also want to check What If The TARDIS Was a Bike Instead of a Police Box? and Kaneda’s Bike From Akira Is Ready To Hit The Road.