Lady Dips Cookies in Milk Bath

by Tracee
(Ohio, USA)

In what film is there a scene where a teacher takes a bath in milk and dips her cookies in it, then is killed by the killer in a high school?

There's also a scene where a guy and his girlfriend are at the school and the cleaning says something about being afraid of the dark, and the the guy responds 'bologna'. The cleaning lady then asks 'you're afraid of bologna'?

What movie is this?