Two geese were about to start wouthward on their annual migration, when they were entreated by a frog to take him with them. The geese expressed their willingness to do so if a means of conveyance could be devised.
The frog produced a long stalk of pond grass, got the geese each to grab an end with their beaks, while he clung to it by his mouth in the middle. In this way the three began their journey. Some farmers below noticed the strange sight. The men loudly expressed their admiration for the travel device and wondered who had been clever enough to discover it. Whereupon the vainglorious frog opened his mouth to say, "It was I," los his grip, fell to the earth and was dashed to pieces.
Moral: When you have a good thing going, keep your mouth shut!