Breakups where u have invested a lot in, easily.
Pain physically is skin deep and in ur head. Many a times I've had physical things happen and it hurts if I think about it but when I would forget I would forget I even felt any pain. It's like twisting an ankle. When u first get up from sitting down its dreadful, but 20 minutes later when ur mind is occupied, u forget about the pain.
But the rawness of the pain of losing someone you care deeply about, such as death or breakups, is the WOAT imaginable.