A watery end

Coming from Ireland, where this sign is quite a common sight, I've never found it particularly funny. But, I've noticed that American visitors to Ireland always find it hilarious. So, for the benefit of American readers of this blog, here is an Irish "Danger - Deep Water - Open Quay" sign photographed at a lock on the Shannon river at the town of Termonbarry between Roscommon and Westmeath.