It took Chelsea all of about 30 seconds to open the scoring against Manchester United and make Jose Mourinho the not-so happy one at Stamford Bridge.

The Portuguese manager's return to his old club set the tie up as one of the most intriguing of the Premier League season so far, with many tipping the now United boss to shock Chelsea by taking all three points at his old stomping ground.

But things didn't start exactly as planned as a hopeful ball forward left United's defenders in disarray, only for surprise starter Pedro to sneak in behind, round the astray David De Gea and slot in a memorable opener for the hosts.

Just what were United's back line doing? And what about De Gea? Days, maybe even weeks, of planning went completely to pot in under a minute as United now have the uphill struggle to break down Chelsea's defence to try and get something from the game.

As per usual, Twitter has provided us with some great reactions to Pedro's opening goal, so here are some of the best ...

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