[dmm]

My Chemistry TA told us that he and his friends were fooling around in the lab and accidentally made methyl mercaptan, which of course began gagging them. So they stuck it into the fume hood and ran. It came out the chimney and prevailing winds carried it across the street to the intake vents of a supermarket. Caused the evacuation of an entire city block for hours. When the firemen eventually discovered the source of the "gas leak", they were not amused.