A senior prank means 38 students at Highland High School at Ewing will not be allowed to participate in graduation ceremonies Friday.  Superintendent Jackie Ebeling says two students broke in through the roof around 1:15 Monday morning and let 36 others into the building. Some furniture was moved into the gym… Vaseline was spread on door knobs and toilet seats and damage was done to the marquee sign. No criminal charges are expected. A total of 50 students will participate in graduation.