Sal's Pizza Scene Analysis

In about the 19th minutes into the movie, the memorable scene that captures my attention is when Sal serve a slice of pizza to a Customer of the pizzeria on a pice of napkin and ask to the costumer pay the slice of pizza for overpriced. Th next scene pans to the Wall of Fame where the customer who just got serve the pizza noticed that this friend (Brother) Spike is not on the wall. Sal then told the customer to have their own place and he can hang a picture of his brother( Spike) and other relative. Sal then made the claim that since he own the place he has the right to do whatever he wants. This scene almost escalated into violent when Sal grabbed a baseball bat but he was stopped by Vito and Pino. This specific scene grabbed my attention