They weren't feeling any pain (SPOILERS)
Even though this little horror movie is obviously a satire, the scenes where the crazy chick punishes the characters with sharp objects are ridiculous. She cut three fingers from a guy's hand and his face was like "hey, come on now, that was unnecessary". One of them even had his balls removed only to direct a silent, angry stare at his sister.
You gotta watch these movies drunk, I guess.
"We all go a little mad sometimes"
Anthony Perkins as Norman Bates - Psycho (1960)