the elizabethan landlady, Elinor Running was reputed to have put chicken droppings into her ale. Her customers were then supposed to have passed out after a pint or two, enabling her to rob them. She eventually got her comeuppance when the locals put her in a tun (barrel) and rolled her down the hill into the river. For further details see this thread on John Skelton's poem.

The "Running Horse" at Leatherhead, Surrey, claims to have been the original pub and it is on the side of the hill above the River Mole.
There's no problem with the beer these days - Linda and I have sung in there on quite a few occasions.