I drove up to the place that does tyres and exhausts, parked my car next to the entrance and, as I got out of the car, a shabby fellow approached me with a hesitant "Excuse me,..." I have long experience of bums, shnorrers and other derelicts, so I gave a dismissive wave of the hand and said something like "Not interested."
He persisted, "But, it's just...", so I turned to him and switched on the heavy irony.
"Listen, bro, if I give you money, promise me you won't spend it on food."
"It's not that, I just wanted to ask you if you could move your car over a little so that my wife can park her car."
I don't know anyone who has such a talent for getting egg on his face as me