In 2000 his side were involved in an infamous incident when they chased and surrounded referee Andy D'Urso after he awarded Middlesbrough a debatable penalty.
The Cardiff striker's long-range strike appeared to come back off the underside of the bar but referee Andy D'Urso judged the ball had crossed the line.
But referee Andy D'Urso waved away the appeals of the indignant Watford players, including Henri Lansbury, whose shot struck the arm of the former England international on the goal line.
Aliadiere, making his comeback from an ankle injury, chased a long ball into the box, and went down under a challenge from Morgan, prompting Boro's appeals for a penalty, but D'Urso gave a goal-kick.