Apostrophe Catastrophes

Lisa S. sent in a Fox headline missing an apostrophe:

Amtrak to Start Screening Passengers Carry-on Bags

That should be Amtrak to Start Screening Passengers' Carry-on Bags, of course.

This is a small error, but a timely one, as a SPOGG member has just started a Facebook group called Ban the Misuse of Apostrophes. Surely omission counts as misuse! If your [sic] on Facebook, its [sic] time to sign up!