(1) Would you have done this if it was a McDonald's instead of a Chick-Fil-A?
No. You expect behavior like that at a McDonald's. Chick-Fil-A patrons are supposed to represent the salt of the earth.
(2) Why did you pay for his food with cash?
Because cash is more personal, is anonymous, and feels more real.
(3) Why did you drive off so quickly as if you were running away from scratching someone's door?
To ensure that I could not see his face and that he would not have noticed my car when he was aware of what happened.
About the father and his family?(1) What was the political persuasion of the man behind you?
Most likely a talk-radio republican.
(3) What do you think the reaction of the father was? Did he feel better about himself or worse?
(4) Did he "pay it forward too?" If yes why? If no, how do you think he felt the next time he went to Chick-Fil-A?
Probably not. Worse.
(5) Did he tell his wife what happened when he got home?
Yes, he would not have been able to stop himself and he knows his kids would tell her.
About the cashier?
(1) What was her feeling when you paid it forward? What does she think about Chick-Fil-A?
She thought it was an act of charity. She thinks Chick-Fil-A attracts good customers.
Now read the parable of the unjust steward (Luke 16:3-13).
How do you think the steward, clearly aware of his own dishonesty and corrupt motivations, would have reacted to the commendation of the master at the end of the parable?
(a) With self-adulation? After all, he is pretty clever and it's good the master recognized it.
(b) With guilt. He does not deserve the praise of the master. He is dishonest.
(c) With incredulity. The praise is meaningless.
(d) With repentance?
The answer is (c). He is not a charitable person by his nature and cannot understand generosity except in terms of what is mutually beneficial and he can only be charitable with someone else's property.