From Matthew Crawford's Shop Class as Soulcraft: An Inquiry into the Value of Work.
Seeing a motorcycle about to leave my shop under its own power, several days after arriving in the back of a pickup truck, I suddenly don't feel tired, even though I've been standing on a concrete floor all day. Through the portal of his helmet, I think I can make out the edges of a grin on the face of a guy who hasn't ridden his bike in a while. I give him a wave. With one of his hands on the throttle and the other on the clutch, I know he can't wave back. But I can hear his salute in the exuberant "bwaaAAAAP! blum-blum" of a crisp throttle, gratuitously revved. That sound pleases me, as I know it does him. It's a ventriloquist conversation in one mechanical voice, and the gist of it is "Yeah!"
Photo from our Vespa oil change guide.