Skepticism, Science & Pseudoscience

If the cocktail is booze and some non-alcohol stuff, like fruit juice or some such, shake away. But if it is all booze, like a Martini, Manhattan, Gibson, etc. do not shake. Instead, gently stir it.

A dirty martini should be stirred and the dirt (some juice from the olive jar) is to be floated on top of the already poured martini.

Never, ever shake a martini. The origin of this hideous meme was a British spy during WWII, Ian Fleming. He was not necessarily a martini drinker. Shaken, not stirred was a literary device, not a drink recipe. No martini lover would ever shake one.