"Succesfull Beggar" joke

A college student walks down the road when he sees a beggar on the side of the street.
College Student (C): Hey mister! whatsup!
Beggar (B): Yea how you doin'...
C: So, how long have you've been a beggar?
B: It's about eight years now kid..
C: WOW! Thats long time.. how much do you get per day?
B: Not that bad... about 250 bucks a day...
C: That's enermous!
B: Yeah.. Enough for living my family..
C: Owch.. you got family too! Where are they now?
B: My wife's dead. I got three children, one of them in Harvard University, one in MIT, and the other one went oversea, he goes to Oxford University...
C: *pause, surprised* That's..that's really great... So, when they're gonna be graduated?
B: No kid... they're not studying! They beg in there! just like me!!