This is someone dying while having an MRI scan. Before you die, your brain releases tons and tons of endorphins that make you feel a range of emotions. Tragically beautiful.
Fans spent decades claiming that Hideo Kojima is a creative genius who's being held back by the studio system, and then the first time a production gave him free rein to do whatever he wanted he promptly made a game where you have to play out using the bathroom in real time so the protagonist can collect his own urine to craft magic piss grenades. It's unclear whether this confirms the fandom's hypothesis.