The Furniture Store And Gino's Pizzas
This is a glitch in the game. I tried it many times to make sure it was true.
If you go buy a pizza from Gino and try to sell it to Ashly's brother who owns the Furniture Store the dialogue box and buying/selling box will turn black. You will still hear the sounds if you press the A button. It's ok though your game did not freeze, just press B a few times and you will be back on the Buy/Sell page.