On a night when many tipped Lionel Messi to prove a matchwinner, the Barcelona midfielder outshone his team-mate while stopping Arjen Robben from proving the matchwinner for the Netherlands.
After 120 minutes, both sides were goalless and Argentina clinched the tie 4-2 on penalties, with many crediting the former Reds man for his role in the win.
Liverpool legend Fowler kept it short and sweet - but his three-word message summed up the mood of the watching world.
Sunday's showpiece event will be the third time Argentina have faced Germany in a World Cup final, with the South American side's last two finals also coming against the Germans.
In 1986, Diego Maradona led Argentina to victory against West Germany, although revenge was exacted four years later at Italia '90.
Twenty-four years later, it becomes a best of three between the two giants of football - and Mascherano will no doubt have a part to play in the Maracana.
Brazil were shown just what Germany are capable of in the semi-final, being subjected to a brutal 7-1 defeat. It will be up to the former Liverpool midfielder to make sure Argentina are nowhere near as open defensively.
This tweet shows there will still be a place for humour come Sunday, though...