Gave a homeless person $3 , what will he spend it on?

Couple months ago a bum was outside a corner store and he asked my friend for some money to buy some food cause he was hungry. My friend said maybe and we went inside (The bum was outside) my friend bought him one of those hotdogs on a bun and he offered the bum it and the bum said "I dont want that crap, I need money". My friend was just trying to be nice to the guy but the bum was a liar and just wanted money for booze. Anyway as we drove away we threw the hotdog at the guy and got ketchup/mustard all over him.