This is a way to show students when the normal schedule is not in place and instead there is a "crazy day" (ex. two hour delays, late start, assemblies, guest speakers, etc.). I talk with my students about how normally our schedule goes in the same order, but today is a "zig zag" day because we have a crazy schedule! Then I write in (on the various end points) what the schedule will be. This has really helped with my students with autism.