For my senior prank.. me and 5 buddies saran wrapped 3/4 of the underclassman's car lot together on senior skip day.. the cars on the ends of the rows got it the worst lol.
A few weeks later I designed a 8' wide, 7' tall, 18' long PVC tube framework to assemble and build around this mean-ass teacher's car that kept parking in the senior parking lot and smoking on her breaks.. once the framework was up we wrapped white plastic sheeting around the outside of the entire framework so that you couldn't even see the car.. the whole senior class wrote comments on it.. it was awesome. The teacher was pissed and blew up at the administrators and wanted to suspend people.. but principal and the school resource officer just laughed it off.. no cameras, no evidence LOL
First pranks in the history of the school too.. got 2 full pages in the yearbook