Aliens: Yes, Millions of solar systems in our galaexy, millions of galaxys in the infinite space, and NONE of them in all infinity has life, there may be lfie out there but not the kind those cranks keep saying abducted them.
Witches and magic, no.
Poltergiests, yes and ghosts yeah. Not everythings explainable and theres been so many reports over so many years (even King Henry VIII had his encounters) to dismiss.