When will Arsene Wenger learn?
Much like in 2011, when he waited until transfer deadline day to make four signings, the Frenchman has left it until the last to make his move.
And the result? Arsenal have sold Alex Oxlade-Chamberlain to Liverpool and look set to miss out on most - if not all - of their top targets.
Julian Draxler is the first. Paris Saint-Germain intimated to Arsenal they would open to selling but according to Germany manager Joachim Low, the 23-year-old is going nowhere.
"I know for a fact that Paris don't want to sell him," Low said on international duty. "They are convinced of his outstanding qualities."
And then there's Thomas Lemar, who despite being the subject of a £92 million bid from Arsenal - which Monaco accepted - will probably be staying at the club.
This is according to the Guardian's David Hynter, who claim Arsenal have missed out on Lemar and will not be allowing Alexis Sanchez to join Manchester City as a result.
Which begs the question of why Arsenal, with five hours remaining of the transfer window, have pulled the plug?
It would appear there are two reasons, the first being that Lemar's preference is to join Liverpool; he has no interest in a move to the Emirates Stadium.
And as if that isn't frustrating enough for Arsenal fans, the second reason is because Arsene Wenger somehow didn't think he had enough time to complete the deal.
It means that Sanchez will be forced to spend another season at Arsenal. The Chilean is desperate to join Pep Guardiola at City but won't be getting his wish.
Worse still for Sanchez is that, according to reports in Chile, he told his international teammates this morning that he would be joining City. Awkward.