There was a potentially serious event at the Phoenix Comicon over the weekend that saw all props banned from the showroom floor. Which would wreck your cosplay plans if, like these guys, you couldn't improvise.
They weren't the only ones trying to find workarounds to the emergency policy, implemented after an attendee targeting Green Power Ranger Jason David Frank was arrested carrying firearms and knives. Here's another sign:
Sadly, both signs (Overwatch & Spongebob) were confiscated by event staff because, being substitute props making light of the prop ban, they were themselves props.