my friends and i did a similar prank, we put a note on our friends car window (he was lead guitar in a band and it was placed after the concert) we had girl #1 write a very bubbly and girly note that said "she loved his music, she was his #1 fan, and such". then we placed my cellphone number (new phone and he did not have the number), had girl #2 from the group leave a sexy message "hey this is Laura leave a message" and waited. I must have waited like 3 days and he finally called!!! hehe.
he left a message saying that it was a nice note and that he did not have that many fans, and it's nice to meet his #1 fan, here is his number. afterwards i called everybody and we all met with him for coffee, and i put up the message in speakerphone. he almost killed me. hehe. i said everybody was in on it. i supplied cell phone, girl #2 supplied sexy voice, girl #1 supplied sexy handwritten message, guy #1 supplied idea, i supplied phone and did not answer my calls for 3 days!!! (so they would all go to voicemail)
he left a message saying that it was a nice note and that he did not have that many fans, and it's nice to meet his #1 fan, here is his number. afterwards i called everybody and we all met with him for coffee, and i put up the message in speakerphone. he almost killed me. hehe. i said everybody was in on it. i supplied cell phone, girl #2 supplied sexy voice, girl #1 supplied sexy handwritten message, guy #1 supplied idea, i supplied phone and did not answer my calls for 3 days!!! (so they would all go to voicemail)