You never know when a velociraptor is going to attack you in the classroom. It's good to be safe and have this sign posted. You use post-it notes to show how many days it has been since the last velociraptor attack.
That is true. Then they would know to stay out of my classroom. Hopefully the students will know to watch out for errant velociraptors who can't read. I mean students are preoccupied and may not even notice a stray raptor attacking them until it's too late. And then I'll have to start out at "0" on my safe days count.