I was recently acquainted with the exhaustive - and blatantly inaccurate and crazy - theorizing by a "Dr Thomas", the "founder" of the Christadelphians.
He was an earlier "contemporary" of Chuck Russell - and some have accused Russell of "stealing" the Christadelphians main teachings. They're probably correct in their accusation. Christadelphians do not believe in the Trinity or Hellfire, are conscientious objectors who do not vote and who hate Catholicism and are scathing in their views of Christendom - although like all "decent" religious groups, JWs included, have toned down their rabid attacks on other religious groups in recent decades.
Dr Thomas's quaint - and hilariously self-important - interpretation of Scripture, led him on several occasions to predict the end of the world in his own day. He was BIG,BIG,BIG on the rapture.
Of course, the fact that every single one of his predictions failed did not stop Christadelphians from growing like wildfire and spreading around the globe to even invade the sleepy shores of New Zealand. Mercifully, the Christadelphians heyday is well and truly over, with successive census's in New Zealand, for example, showing a continuing decline of membership.
The Christadelphians - a vainly fading precursor of what awaits the witnesses in the decades to come.