Spanish or English?

Oh it was so funny yesterday! I work in this pubilc secondary school and Sandra the lady I work with has told me to pretend I don´t speak a word of Spanish. well... Yesterday of course as teenage girls do, they where talking about me and laughing, just the normal thing about being foreign etc... Ha ha! I just couldn´t resist! I went over and whispered in her ear " I understand more than you think" in Spanish! Her face dropped, sadly didn´t have my camera! Brilliant, just couldn´t resist! I wonder how long it will take to get round the class that I speak Spanish....Opps