I had to make a cover of a song with a group I was put in for my music lesson. No one but me learnt their parts and everyone, including me, got shouted at. Ironically, I was too busy praising for my piano exam to get all the group together (because let's face it, anyone except you is lazier than a pentioner on Ritalin).
Day karma'd itself when I saw someone attempting "parkour" and ending up breaking a school CCTV camera, a glass window and falling flat on their face.