But 'grammar' in a different sense. Every sentence is full of ambiguities which you must resolve using your knowlege of sentence structure, word structure, and semantics. The words and their order are the same under either interpretation. Our mental dictionary, the list of about 50,000 words we keep in our heads, tells us that left and waffle can either be nouns or verbs. The point is that we must apply knowledge about words and sentence structures which is not present in the sounds in order to interpret such sentences as this one either way.
Sentence structure is an invisible but essential part of the mental processing of language.
It is a major component of humor in all languages. The unusual word order, perhaps the marginally productive verb to bear led the child to misanalyze the title of the song and assign the phrase the wrong structure, which led to a misperception of what was intended by the song. L anguage tells us much about ourselves, not only how we speak but why we laugh. It has been the object of serious research for 4,000 years. The best news is that you can find out much more about it right here at this university.