Source for bottom sketching: Prehistoric Spear-Throwers by Dorothy A. E. Garrod (1955)
Many prehistoric (and some extant) hunters and warriors made use of the spear-thrower to increase the efficiency of their weapon. This particular example was found in a Paleolithic cache in a cave in Mas d'Azil, France. At the end of the thrower where the spear sits, an ibex is seen crouching, and, well, relieving himself. Apparently, this humor was appreciated by the Paleolithic hunters of the Pyrenees mountains, as a number of similar weapons have been found (some more are included in the sketching). Even in early times, man had the ability to treat a solemn topic, the killing of other animals, including humans, with the levitas of a modern comedian.