The entire plot of "Big Deal on Madonna Street" is an elaborate setup for a spectacular failure. After numerous comical setbacks during the planning phase, the remaining members of the gang finally break into the apartment they believe adjoins the pawnshop. Their plan is already in tatters: Tiberio's arm is broken, Mario has abandoned the heist for love, and Cosimo is dead after a botched purse-snatching.
The climax of their ineptitude occurs when, after painstakingly breaking through the wall, they emerge not into the pawnshop's safe room, but into the apartment's own kitchen. They have breached the wrong wall. As the realization of their complete and utter failure dawns on them, and with morning approaching, they abandon the heist entirely. In a moment of supreme anticlimax, they decide to raid the refrigerator and cook a meal of pasta and chickpeas. Their grand criminal endeavor is thwarted not by police or a rival gang, but by their own incompetence. The heist ends with Capannelle accidentally causing a small gas explosion. The final scene shows the gang members dispersing one by one into the early morning light, heading back to their lives of quiet desperation, with Peppe resolving to get a real job. A newspaper clipping at the very end reports on a strange burglary where the culprits only stole some pasta with chickpeas, the final, pathetic epitaph for their "big deal."