I don't have a GF, but I'd probably either laugh all the same or I'd do the typical "Euwgh!" reaction of the 2 boys who annoyed that principal so.
Finding out you were being stalked by some creepy crazy old man for no logical reason.
We'll murder them all, amid laughter and merriment...except for the few we take home to experiment!
"I cant see S***! --YOU GO TO HELL!" --Tourettes guy