Yeah - that's right kids, the jetpack can be used for time travel in addition to space travel; and we all know that space travel is a necessity for time travel.  But back to our time-transformed, intergalactic Halloween adventure.  Seeing as witches are a cornerstone to the Americanized (i.e. bastardized), early Christian co-opted pagan holiday turning it into All Hallows' Eve (but let's be honest, pagan dead worship is far more interesting than the benediction of a bunch of long gone, over pious zealots, most of whose only interesting accomplishment in life was their death).

Anyway, in order to better understand your witch fixation I decided to pop in on colonial times and observe some witch trials to check out the roots of American paranoia with respect to supernatural nonsense.  To sum it up, a bunch of tripped out Puritans couldn't handle a few bites of psychedelic bread (not surprising though, I wouldn't trust a fundamentalist of any sort on so much as a single cup of coffee), then go super freak-out and execute a bunch of poor saps because they can't handle the trip.

My conclusion from all of this:  Puritans are far scarier than witches (and yet, still no match for dinosaurs from space)...