Premier League defenders have spent the whole season trying to figure out how to stop Erling Haaland - without much success.
But perhaps they could take a leaf out of Antonio Rudiger's book after the Real Madrid centre-half did an excellent job keeping Manchester City's talisman quiet on Tuesday night.
It wasn't just the German's tackling, anticipation and positioning that ensured 51-goal Haaland endured a rare off-night, but some dark arts too.
A video clip filmed from the stands at the Bernabeu during the Champions League semi-final, first leg showed Rudiger deliberately irritating Haaland as he stuck to the City man like glue.