Presenter Jeremy Clarkson, 61, has been pranked by Ant McPartlin and Declan Donnelly as they 'vandalised' his Diddly Squat Farm.The graffiti and 'vandalism' was spotted at the star’s Diddly Squat Farm this week, but it was all part of a practical joke which will air on ITV show, Ant and Dec's Saturday Night Takeaway, according to OxfordshireLive.