A post on here reminded me of a couple more. One of my first jobs was a factory next to a pub cfalled The Greyhound in Birmingham, known as The Scrumply house as it only sold various types of Cider. Old guys in there told us that flicking fag ash in the cider made it much stronger, but it had to be Park Drive cigs and tipped didn't work. Also dropping an Aspirin in! And after that we should leave the pint on top of the old stove in the bar. Did it work? Well, I got so drunk X'mas lunchtime that I was literally in bed recovering for a full week!