Yeah, petty revenge, basically :) I put a nichrome wire, in yellow plastic cover, between Vcc and Gnd. I told him to ensure that the circuit matched the schemat

Yeah, petty revenge, basically :) I put a nichrome wire, in yellow plastic cover, between Vcc and Gnd. I told him to ensure that the circuit matched the schematic. He didn't remove the wire, so once he powered the thing up, it caught fire. I don't know if the circuit worked with it removed (it should have, but I wasn't present when the assignment was due).