Mad conspiracy theorists strike me as less imaginative now than they used to be; the same tired old grooves are worn through (UFOs, Lizards, 9/11 et al). Why don't they pick up some of the more intriguing looser threads? Here's a bronze coin from the period of Herod the Great. One faces shows -- no, not a UFO, but a military helmet:
But what interests me more is the other face of the coin:
The legend there tells us under whose reign (Bezonian): BASILEWS HRWDOU, 'of King Herod'. But look at the cross, just to the right of centre. Doesn't that merit a loony conspiracy theory? Really?
Looking into it, scholars seem to suggest it is either (a) a version of the Egyptian 'ankh' symbol, with religious signification; or (b) 'a mark of monetary value, "TR", a piece thrice the value of the chalkous, or smallest copper coin.' But come along! That's ordinary and boring. Surely we can do better than that. Let's start with: Herod was a time-traveller from a Christian future, who ...
You can fill in the rest for yourself.