mopar haters

I bought an 8 3/4 741 rear end and took it to school and was rebuilding it, and i ran across another 8 3/4 but it was a 742, so i decided that i would swap out cases (first 8 3/4 is out of an abody) so i take it apart to and i have 2 seperate containers with the bolts from each rear end. Well this dipshit in the afternoon class (i only go in the mornings) dumped out one of the containers and mixed it both sets of bolts together, and uses my container for something else. Well that pissed me off so i threw all of his crap on the ground. So i come in this morning to finish everything up, and he put jb-weld all over my brake springs and shoes, and dumped tranny fluid on my shoes. Why people would mess with other peoples stuff is beyond me. Do any of you guys have horror stories like this?