There is no absolute sense of continuity in the stories, although certain plot and presentation elements remain mostly constant, including purposeful contradictions in Popeye's capabilities. Popeye seems bereft of manners and uneducated, yet he often comes up with solutions to problems that seem insurmountable to the police or the scientific community. He has displayed Sherlock Holmes-like investigative prowess, scientific ingenuity, and successful diplomatic arguments. In the animated cartoons his pipe also proves to be highly versatile. Among other things, it has served as a cutting torch, jet engine, propeller, periscope, musical instrument, and a whistle with which he produces his trademark toot. He also eats spinach through his pipe, sometimes sucking in the can along with the contents. Since the 1970s, Popeye is seldom depicted using his pipe to smoke tobacco.