What bike Cannot be stolen?

Excuse me, could you elaborate on the enigmatic phrase, "What bike cannot be stolen?" I'm intrigued by the concept of a bicycle that is somehow impervious to theft. Is it a technological marvel, perhaps equipped with advanced security features that Render it untouchable? Or is it a metaphorical bike, representing something intangible or unattainable that cannot be taken away? Clarification would be greatly appreciated.