How do you deal with practical jokes?

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I was lingering in the lobby of our school last night when out of a sudden, a very unfamiliar girl approached me with a gloomy face and asked me why I've been forsaking her. And then, I came to realize that the words she's muttering were a part of the script in one of the famous TV series here in the Philippines. Honestly, I really didn't know her and I can't remember any occasion that we met. I get annoyed since a lot of people were already looking at us and I felt uneasy and ashamed but still, she continued to deliver the scripted lines with faked and practiced emotions on her face. She looked really stupid and crazy. I hate it because she's so annoying and very shameless. But then, I just gave out a smile and turned away. I don't say mean things because I don't wanna hurt her feelings. I really don't know how to stop her from doing that joke to me. Few minutes before I wrote this discussion, she came again with her old lines and I really get embarassed because a lot of my friends were already teasing me. I just don't know how to put an end to her silly deeds without causing any trouble or conflict. She really never knew how inconvenient it is for my part and how it caused me a lot of discomforts, as I have built for my self here in our school the reputation of being less confident and less self-esteem. She seems to even put me lower with my already dwindling self-esteem.