Originally Posted by
Croaker
1982. Poured some sulfuric acid down the drain in my college chem lab sink during a qualitative analysis experiment. Hissing, strange smelling gas from drain, professor (very old Armenian who had made poison gas for the Germans in WW1) shouted "Gas!!!) and we evacuated the lab. He set up fans, blew the fumes out, and we returned without LAFD Hazmat being notified, as probably was required. Turns out there was some arsenic in the drain from another student who did not flush it completely down. ASH3, or arsine, is one of the deadliest gases in existence! Passed the class but nobody wanted to be my lab partner after that. No harm done, though.