Campbell had his first senior spell on-loan at Royal Antwerp.
"We had a four-bedroomed flat and it was chaos," he recalled to the Daily Mail.
"I remember one day we were bored so went to the equivalent of Toys r Us, got super soakers, water balloons and were just driving down the streets watering people from the car.
"Then we got a call from the manager saying: 'What the hell are you doing?' It didn't help that we were driving a car with the team badge on the side.
"It all helped me grow, though.
"Some of my first experiences in life were out there."