And I've figured out how alcohol makes a drunk fall. Place one drop of alcohol in the water where the tack is "floating" and it will sink or "fall". Alcohol breaks the surface tension - I've seen my neighbors lose all their surface tension on Friday and Saturday nights.
Alcohol also breaks down the forces that cause a person pants to stay up. http://www.freerepublic.com/focus/f-news/691026/posts#25