We've all posted stuff we've regretted the next day, but can anyone say they've screwed up this bad?

Ballsy sporting predictions and international trash talk between countries are nothing new — just take a look at what English cricket fans were doing after Australia's ball tampering scandal. But the playful tension between nations tends to rise to boiling point during the FIFA World Cup.

The tournament presents a golden opportunity for plucky underdogs to flex their muscles in front of footballing heavyweights on the game's largest stage. With this year's global audience tipped to reach 3.4 billion (minus thousands in Australia suffering through Optus's streaming fiasco), the weight has piled on players to avoid an international embarrassment.

But for German newspaper Welt am Sonntag, the confidence in their national team and defending FIFA World Cup champions was too strong to shy away from ribbing Mexico ahead of their Group F opener on Monday morning.

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The publication took a cheeky jab at the Central Americans on its front page, parodying US President Donald Trump's "build the wall" slogan with a brick wall in front of their goal under bold text reading: "Sorry, Mexico. Today WE build the wall."

Their editors learnt all too well that ink is permanent upon the full-time bell, which saw the 2014 victors scoreless and humiliated with the score at 1-0 to Mexico.

Fans mocked Germany on social media after the upset loss which saw them sink to the bottom of their group.

Thousands of jubilant supporters partied in the streets of Mexico City after their shock victory over the World Cup holders.

The earth reportedly moved in quake-prone Mexico City when Hirving "Chucky" Lozano smashed home the game-winning goal in the 35th minute in what was described as a football "earthquake of joy".

Seismologists said that they had detected an "artificial" rumbling, possibly caused by "widespread jumping" when the goal was scored.

Fans crammed into the Zocalo, the city's main square, to celebrate. "What happened today was an earthquake of joy for us — just imagine, we beat the world champions!" said Laura Villegas, a 45-year-old merchant who downed her beer with tequila in one gulp.

"What happened hey, what happened hey, to the Germany that was going to beat us today?" the crowd chanted.

Germany's shock loss means everything is riding on their next game against Sweden on June 24, but they won't be in unfamiliar territory.

Russia marks the third World Cup this century where a defending champion has lost the first game in the group stage.