trick or trigger

the definition of "Trick or Trigger" is about a person killing someone by gun-shooting during Trick-or-Treating on Halloween. It doesn't always have to happen during that time (in other words, someone just getting shot on Halloween).

"i hope this is Trick-or-Treat moment doesn't go bad"
"What do you mean John?"
"There are Trick or Triggers out here. Be safe ok?"
"Ok thanks!"