#2 Spain v Switzerland, pre-World Cup friendly
Final score: Spain 1-1 Switzerland
A larger fraction of the fraternity remembers de Gea's spill against a left-footed Cristiano Ronaldo strike in the World Cup group stage, but not all of them stapled the Spain number 1's howler against Switzerland in the build-up to the premier footballing event.
In an affair where Julen Lopetegui's side were widely tipped to demolish a rather out-of-sorts Swiss side, they registered a lackluster draw. Chances came in abundance and were squandered, but it was the Manchester United goalkeeper's fumble that granted Switzerland an unlikely equalizer.
Arsenal full back Stephan Lichtsteiner tried to curl one with his left foot, but his effort lacked venom, and moreover, it should have been gobbled up by de Gea. Instead, the goalie tried parrying it away and gifted it straight to an unmarked Ricardo Rodriguez, who made no mistake in cancelling out Odriozola's opener.