Out of all the crazy theories about electron my favorite is single electron universe. That all the electrons and positrons are actually single particle that that goes back and forth in time, and positron are exactly the same as electrons just going in the opposite direction in time.

It neatly explains what and why is antimatter and why all particles of given kind are exactly the same. Although it's a hard sell because it predicts that all of the matter-antimatter symmetry breaking is not intrinsic or even spontaneous.

Also it make hard to wrap your head around how antimatter could form any macroscopic objects while going back in time. Or how it can behave exactly like matter while going back in time.