Booze makes you see double (or triple, quadruple, or more, especially if Rule of Funny is in effect), and sometimes the drunk will assume both of whatever he's looking at are real. A variant has the drunk afflicted with double-vision trying to interact with "the one in the middle" (although since most people only have two eyes, normally you'd only see two of whatever it is). Generally a Discredited Trope nowadays. For hallucinating things that actually aren't there while under the influence, see Pink Elephants. Examples of Single-Malt Vision include: