**Not so fun fact:** milk chocolate contains butyric acid which is a short chain saturated fatty acid found in the form of esters in animal fats and plant oils. It comes from the milk additive that has changed in chemistry in processing which gives a distinctive odor and taste. Butyric acid is also found in your digestive tract and gives human vomit the same distinct odor and taste. Yes, Hershey's milk chocolate tastes and smells like vomit for a reason. Enjoy your puke chocolate. **Bonus fact:** some tools and consumer products from the 90s and early 2000s have a butyrate/butyl rubber coating on them which breaks down into butyric acid over time. The rubber becomes sticky and smells like someone threw up in your toolbox. I hate Snap-on and Matco tools from that era for this nauseating smell they have.