There seems to be a serious disconnect between the reactions of the two characters. The woman appears worried but calm, while the man seems to be in a desperate situation (or is in the middle of a serious dance routine). This might be because the actual reactions seem to come from two completely different scenes in the film. Interestingly enough, the other posters show him in a similar pose while trapped underwater, which seems to make a lot more sense. Their drastic contrast in reactions makes the poster more laughable than frightening.