They are students so it's easy. Next time they have a house party grab eggs, bits of chairs, a shovel and a load of rubbish. Step 1: dump all the rubbish on the front lawn (if there is one), step two: throw all the eggs at the house, step three: break a few windows with the bits of chairs but leave some outside and step four: dig a big hole in the lawn or better still get them to do it. Finally step five: call the guards and the landlord and tell them how the students wrecked the place. Sorted