Keywords: acetone, cyanide, odor (PubMed Search)
Goldfrank's sniffing bar: no this is not a pub where toxicologist's hang out but rather a bar that assists with teaching the recognition of odors related to toxicology. Certain drugs and compounds have a distinct aroma.
The following is a list odors, see if you can name a medication or compound that has that odor - scroll down further to see the corresponding answers (if you really got all 5 email me and convince me):
1) Bitter Almond
2) Rotten Eggs
5) Sweet, Fruity (acetone)
1) Cyanide; 2) N-acetylcysteine or Hydrogen Sulfide; 3) Methylsalicylate (like bengay); 4) Arsenic, organophosphate insecticides; 5) Chloroform, chloral hydrate