"Why thank you."
The young man carefully scoops out his purchases into paper bags and counts out coins.
He pops a sweet in his mouth. Instantly white fur grows from his skin and his face lengthens into an animal muzzle full of sharp teeth!
"Whoops! Ha ha!"
Swiftly (or as a move, one might say) he returns to human form with a contrite look on his face.
"I beg your pardon. Sometimes my former nature gets the better of me. I hope I haven't behaved inappropriately. Needless to say, it had nothing to do with your delicious wares."
"I would be most interested to help if I can. Some of my contacts are a little like ghosts, yes .. Others more like legends or impressions of many minds. The spirits may grant me their knowledge, in a place where such knowledge was found, or sometimes just as usefully, their skill and cleverness to help solve a problem."
"Would you mind if I come by in the morning and sit by your 'Shack? I'll certainly stay out of your customers' way. I wonder if I can draw forth memories of this marvelous tradition that you may not be aware yourself that you carry with you."