Written in Chalk

When you need to drive home the fact that a student has just exercised an appalling lack of common sense, and you're not allowed to make him flat-out write "I am an idiot" a hundred times, there's this. 

Waxwork Like Clockwork

Having a building full of uncannily realistic yet distinctly un-alive figures is off-putting enough without the history behind some of the stuff associated with wax art.  You know, like death masks.  And voodoo dolls.  And recreations of disease and anatomy for medical students.  And the "chamber of horrors" which a significant percentage of wax museums possess. 
Honestly, it would be a lot weirder if there weren't any horror movies involving them. 

High School Lesson #0008

Face it, a lamppost is not the worst thing you could run into (and facing it will help prevent you from running into things in the first place). 

Claws for Concern

If some wolves start coming after you, don't run, because if you run, they will chase, and they're a lot faster than you are. 
But if some wolves are running from something else...  run like there's no tomorrow, or you really might not see it.