What should I reply to this stranger? (Please read for details)

So I received a text message (three, actually - 1 on whatsapp and 2 on regular SMS) from a stranger who thinks I'm a girl whom he apparently met yesterday. The empathetic part of me feels sorry that he was given a wrong number, the mean part of me wants to laugh at his 'misfortune', and the mischievous part of me wants to pretend I'm the girl he thinks he's messaging! Just so you know, I would ultimately tell him nicely that he got the wrong number but just out of curiosity, how would you respond??

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