I'm just hypothesizing here, but this is what I think happened.
Kawasaki sends down the call to stop making x color bikes with silver frames. Black frames are in. The plant manager looks at his parts warehouse and sees x,000 silver frames and plans to build xx,000 new bikes. The paint shop gets an order to repaint all the silver frames black so they can be used, no harm, no foul.
3:25 PM on Friday (time and day changed to reflect U.S. standards) Johnny Painter sees what time it is and thinks, "I can get one more frame before work is over." The paint starts slinging and the whistle sounds at 3:30 PM. Only half the frame is done, but JP has big plans with the misses, they've got front row tickets to the WWF Sumo Royal Rumble and he can't be late - she loves to see Hulk Ho Chin wrestle. Glancing at the finished side he thinks, "Okay, she's done, gotta go, I'll return it to parts on Monday."
Saturday morning rolls around. Maintenance needs to paint some parts, so the frame gets sent back to parts, unfinished. As the frame goes through production no one notices the paint error until it's the bike is complete. When it gets to the dealer, they notice it during setup and are reluctant to sell it as is for fear of taking a price cut for an irregular bike. Two days later a young lady walks in looking for a Ninja. Having one brown eye and one blue eye since birth she sees the multicolored frame of that Ninja and knows it was meant to be. She and the bike both have their subtle differences, but they were made for each other. They have a long and meaningful relationship, but a few years later she has a chance to move and get a big promotion. The Ninja is sad, but tells her that it's better that she goes. The Ninja says that it will never forget her.
The bike changes hands a few times, each owner noticing the frame but not seeing it as a big enough problem to be remedied. It finally makes it to damarble's care and he's kind enough to show it to everyone so we can point and laugh.

8)
That's just one possibility, though.