Adriaanse is famous for his controversial training approach. At Willem II, he once ordered his whole squad to follow him by car, while they drove 13 km away from their training ground. At a remote spot, all players had to give their car keys to Adriaanse. Then he drove back to town, while the squad had to run in front of his car. Back at the training ground, the players got their car keys back. Since their cars were still parked far from the training ground, however, they all had to walk back another 13 km.
At AZ Alkmaar he once ordered the whole squad to search for Easter eggs during a training session. They looked for an hour until Co Adriaanse finally revealed there were no eggs hidden. Adriaanse already had these strange training methods at the start of his career, because when he was a youth trainer at Ajax, he sometimes ordered his players to lie on the ground. Then a teammate (with football boots on) would run over the bodies.Because of all these infamous incidents, Adriaanse is sometimes nicknamed "Psycho Co".
