The only creatures on the planet that seem to like beer more than men are slugs (snails).  Like men, these slimy creatures will often head out under the cover of darkness to find beer, but whereas men have developed an incredible ability not to fall into their pints, snails have yet to reach that crucial stage in their evolution.  Unfortunately for them, but happily for the gardener, the snails will die when they drop into the submerged glass of ale you have generoulsy left out for them.

Snails also detest the smell of peppermint and spearment, so an infusion made from the leaves, poured or sprayed around the plants you want to porotect, will send them oozing and sliming their way to more attractive pastures!  Best to do this at dusk when snails start to emerge.