Please Homeless Anything Helps God Bless

Driving back from the Lake Of The Isles dog park just now, I saw a guy in a minivan give a couple bucks to a guy standing on the corner holding a cardboard sign. It struck me that it was one of the few times I've seen that happen since this or even this. It made me curious: When you see someone asking for money, do you give or not? Why or why not? Do you have rules? Does it depend on your mood? Your cash-in-pocket? How do you feel if you do or don't? Please do tell anything helps God bless.