There are many baffling beliefs and practices of JWs that are shared with other groups, so I will try to stick to something that is unique to them.
The fact that JWs have believed for 100 years that they may NEVER DIE is the craziest, most delusional belief! Everything that has ever lived, plant, animal, human, fungus, microbe, EVERYTHING that has ever lived HAS DIED, yet they insist that if you obey a group of men in NYC you will be the exception. It baffles me that I once thought this. They think they will cheat death when nothing ever has. They then build and structure their whole lives from what career to choose, higher education, marriage and children etc around this delusion.