Serious question, I have no idea. Is there an established tradition, sequence of events, rule?
I just asked some kids, and they said they’d come later and secretly do some trick on me, but they didn’t seem too sure about it either.
This in Europe btw.
According to this he wasn’t exaggerating. Tricks, pranks, theft and vandalism used to be the default; candy and organised parties were introduced later to placate the rowdies.