(Strip Number 6711, Original Publication Date, 1 November 1987)
Panel 1: It's Halloween Night in the Sundayverse and we find Lizzie asking Mike who invented it in the first place.
Panel 2: Lynn attempts to pay tribute to her idol but having him not know for certain but suspect that Hallmark did it.
Panel 3: She sets things in motion by asking her jerk brother who gets off on messing with her if he thinks there are ghosts.
Panel 4: Since he sees an opportunity to be a smart-ass, he says there're probably some in the room right now.
Panel 5: She seems to have bought it when she asks "NOW?!"; he then says that they're all around them.
Panel 6: He then seems to frighten the shit out of her by telling him they're coming for her.
Panel 7: He gets what he wants when she screams in terror.
Panel 8: He gets what he deserves when she whaps him on the head with her toy bunny.
Panel 9: She asks a baffled Mike if she got any of'em.
Panel 10: Since she didn't run screaming to Mommy (and thus wind up getting him grounded for being a creep), he opines that they've stopped making girls the way they used to.
Summary: Lynn seems to have developed a fondness for this punchline because every so often, Mike would get gut-punched for shooting off his fat yap and being a dick to his kid sister only to make a dumb comment like this. She had to repeat the process because cement-headed Mike doesn't learn from his mistakes.