Left image: A person wearing a t-shirt that says "You Only Live Once" lying dead on the dance floor of a club probably due to drug overdose.
Right image: A crying baby
The image is ironical, as the person is believes that "You Only Live Once" (as can be seen from the t-shirt), and hence drinks and parties a lot, and is dead probably due to drug overdose. However, it is shown that the person re-incarnates as a crying baby, which goes against the person's belief.