Grumpy is a Tyrannosaurus Rex who is featured as one of the main villains in the 1974 TV series, Land of the Lost and later secondary antagonist turned supporting protagonist in the 2009 movie of the same name. He chases the main characters attempting to eat them and, as his name suggests, has a very short-tempered behavior. At the end it was revealed that his anger was caused by a constipation which was successfully erased away. He lives happily after this.