There's a SPIDER in your hair.

Something funny happened yesterday in class, when discussing speech acts, that I thought I would share. We were focusing on the three main acts of locutionary, perlocutionary, and illocutionary. I had my head down looking at my notes in front of me writting Myers' previous remarks when I heard Charity say behind me "There's a spider in your hair." My whole body jolted in my seat and then I turned around to Charity and said "What! There is?" She smiled and said something about the examples Myers was writting on the board. When I looked I saw 5 new sentences on the board, the first reading "There's a spider in your hair." I then laughed at myself, relaxed, and started writing down more notes. Charity's locutionary act of uttering the sentence, caused me to perform the perlocutionary act of jalting in my seat, becoming frightened because I don't like spider's in the least, and asking her for conformation. I'm not sure what the illocutionary force was because to me it was a warning if a spider was actually in my hair but she was reading it aloud from the board. What do you all think?