answer:Most memorable would have to be when I oh so stupidly confused a beaker of water with a beaker of some organic compound (I can't remember what) and in a hurry to distinguish which was the water, TOOK A BIG WHIFF of the liquid. After regaining consciousness in the hospital, I had a bad nosebleed and a pounding headache for a day. Evidently, I came close to killing myself in an inadvertent "huffing."