So, the drunkard said that if yesterday was tomorrow, and today's Friday, on what day of the week did he say that? So, we know that today's Friday. And we know that our yesterday was the drunkard's tomorrow. So, if you really think about it, the correct answer is Wednesday - on Wednesday, the drunkard said tomorrow, and since today's Fridays, it means that his tomorrow (Thursday) was our yesterday. La respusta es Miercoles.