A pelican walks into a bar and asks, "do you have any pond water?" The bartender says no and the pelican walks away. Two days later the same pelican walks into the bar and asks, "do you have any pond water?" The bartender answers with the same reply that they don't have any. Two weeks later the same pelican walks in and asks "do you have any pond water?" The bartender gets angry this time and answers with " No we don't have any and if you ask again I'll nail your feet to the floor. Two months later the pelican walks in again and asks "do you have any nails?" The bartender doesn't remember about threatening to nail the pelicans feet to the floor and answers "well... no" "Good," the pelican replies. "Do you have any pond water?