I've given food and not money.
My sister in-law's bf, who's naturally a nice guy, gave money to a homeless guy near his old office in hoboken about a year back. He would make small talk with him just to make him feel like someone cared. A few days later, he gets a phone call on his cell phone and it's the f-in bum!!! He was calling to demand more money. Apparently, the bum followed him back to his office and somehow managed to get his number from the receptionist. What kind of idiot gives out phone numbers to a bum?!?!! Strange but somewhat funny story. Poor guy had such bad luck over the last couple of years....