WATCH: Guess which movie theme tune provoked this hilarious reaction from a toddler?
They're probably the most recognisable two notes in movie music history and they instil fear into the very soul of anybody who has seen the movie Jaws.
John Williams's score for the 1975 movie earned him an Oscar and the two-note shark theme is as unnerving today as it was back then.
In fact, you don't have to have seen the film to feel that horrible sense of fear and foreboding, as this toddler proves.
Check out her face when the shark theme kicks in...