Characters
There are things I will not tolerate: students loitering on campus after school, horrible murders with hearts being removed...and also smoking.
— Principal Snyder · Buffy the Vampire Slayer
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker lists what they refuse to tolerate: students hanging around after school, gruesome murders involving removed hearts, and smoking. The humour comes from placing petty rules and horrific crimes in the same breath, as though all three offend equally. It is an officious, deadpan ranking of offences.
Context reviewed