The 2017 referendum marked a transition from an already incongruous parliamentary system to rampant presidentialism and created more conflicts rather than defusing them. Given the extraordinary conditions under which the referendum was held, and the limited time allowed for discussion of its possible ramifications, any effort to analyze the eve and aftermath of the referendum provoked more questions than answers. Why was the referendum held in 2017, although the governing party had advocated for a new constitution and transition to a presidential system since it came to power in 2002? What was the attitude of the voters towards the presidential system? How did popular support change or did it in fact change during the referendum campaign? The analysis of these questions presented here relies on extant research to inventory what we really know and do not know about the most recent Turkish referendum and why these unanswered questions might have critical consequences.