How much Bitcoin do you pay for a pizza?

Could you elaborate on the intriguing question of 'How much Bitcoin do you pay for a pizza?'. It seems to be a curious inquiry that taps into the intersection of cryptocurrency and everyday transactions. As a professional practitioner in the field of cryptocurrency and finance, I'm intrigued by the historical context of this query. Could you explain what it refers to? Is it a reference to a specific event in Bitcoin's history? Or perhaps a general curiosity about the current value of Bitcoin when compared to the price of a pizza? I'm eager to delve deeper into this fascinating topic.