Would Liverpool winning the Quadruple be the best feat a team has ever accomplished in football?
Many teams have won a treble but to my knowledge none ever have got a clean sweep. Manchester United, Barcelona, Inter Milan, Bayern Munich, Celtic, Ajax and PSV have all won the treble of European Cup, league title and domestic cup.
Or was Leicester winning the Premier league better? Or Aguero last minute goal?
Or something even completely different such as Greece winning the Euros?