The sign on the table reads: "If you can read this label, please clear the table." If you can read? Now, what is that suppose to mean? Do you detect sarcasm?
Then we saw the smaller original sign on the table that ask patrons to clear their table. Perhaps it was too small to be read. Now, you cannot miss the instruction at all. In fact, you cannot even not understand what clearing your table means since it is spelt out exactly for you.