April fools joke help!?

ok well me and my friend are going to prank our other friend by writing an anonymous creepy stalkerish note and putting it in her purse so it will freak her out when she reads it. lol. shes really gullible so we know she will fall for it. but im not really coming up with anything crazy right now that would scare her. we want her to think someone has been watching her and following her. she works at taco bell if that helps lol. so does anybody have any creative ideas to put in the letter?