No corpse stories, except perhaps dead badgers while cycling. I once forgot to start an extractor when I was carrying out a process that gave off sulphur dioxide and started to fill the lab up with that, not so much a smell though- it's a bit like freshly burnt matches- as extremely irritating (it dissolves in the water in your eyes and lungs to form sulphurous acid- it tends to make you cough a bit). Currently doing some work with thiols (sulphur-containing organic compounds), so far I haven't forgotten the extractor but it doesn't take much to cause a stink- they are noticeable at quite low concentrations in air. I can still taste one of them now.