Most Goofy AND Dangerous? Scientology.
Mormons only APPEAR harmless, kind of like the Amish. All goody-goody and family oriented. The dark truth is that they are high-control cults with an "us-versus-them" mentality and would as soon stone you to death for not being the same religion as them, except they NEED your money too much, so they smile and pretend to like you.