When strangers call I usually ask "hey.. whatcha wearing right now?". I lead this full blown conversation for a good hour which kinda turned into something like phone sex one time.. it was obvious she mistook me for her boyfriend.
At the end I said "SAY MY NAME *****" and she said "Ooooh Marshall!" I said "Nope, it's DC and you got the wrong number". She's like "oh shi........." and she hung up and I never heard from her again.