3. The transfer to Real Madrid
Real Madrid have a notorious reputation for poaching the best players from other clubs. Coming to Manchester United, Los Merengues have already stolen David Beckham and Cristiano Ronaldo in the past.
In 2015, Florentino Perez came knocking the doors at Old Trafford yet again, this time for David De Gea. The Spaniard was at the height of his powers, shining like the only beacon of hope in dark times at Old Trafford.
After courting him for almost two seasons, Los Blancos had finally managed to crack a deal for De Gea in lieu for Keylor Navas and £29m fee. However, the transfer failed to go through on the deadline day that summer, thanks to a dodgy fax machine that delayed paperwork.
De Gea signed a contract eleven days after the transfer window slammed shut penning a new four-year deal. As for that fax machine, hope Manchester United never repair it!
