Thomastwharry said:Go to his table and find a card that has been sitting there for awhile. Tell him that he needs to mark down the price a little bit because the card looks as if it's faded. Tell him "it's almost as if it faded after years of sitting in your case under those lights".
Either that, or just go up to his table and ask him to show you a bunch of cards one by one and give him lowball offers. Or tell him boring stories about your card collecting past just to get a rise out of him.
Another fun one would be to show him a high value card and offer to sell it to him for maybe 1/10th of what it's worth. When he agrees, tell him "wait, nevermind" and walk away. Then go back later and offer him the same deal again, then retract it again when he accepts.
Pushing peoples' buttons is fun! Especially tools like this who deserve it.
This is a very devious and interesting take on how to get them a going! LMAO! I may have to give it a shot?

Oh yea! Thanks for the chuckle!

Brian