When you drink so much that everyone else sees you blur.
It is not unusual for people to get blurred vision after drinking too much. It is unusual to drink so much stout ale that you become a blurred vision for other people. The magical effects of this can come from either the drunken enity itself, forgetting how being drunk is supposed work, or from enchanted alcohol that causes the entity to forget practically everything else as well. It is known that fay can mess up their glamour if too intoxicated, allowing three or more of them to walk down the road.
Sometimes all versions of an individual are inexplicably solid, and can lead to great confusion when one is arrested and disappears the next morning, and to great fun when they all go home to bed. Especially if they already have a wife.
Time travelling wines are a common culprit for causing accidental time loops with oneself and a really good bottle of Château Christinegård du Norway 2320 is often cited as the cause of chronic alcohol poisoning, despite knowing that the last round you bought for yourself must have had 10 pints on the tray.
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