As the first session of qualifying got underway at Monza, drivers were desperate to head out onto track and set their initial lap times around the circuit.
However, McLaren and Piastri were a little too keen, speeding out of the pits and into the path of Verstappen's Red Bull, forcing the Dutchman to hit the brakes to avoid a collision.
Verstappen released a characteristic x-rated rant over the incident via team radio, after the McLaren mechanics missed the Red Bull when letting Piastri go.
McLaren penalised for unsafe release
The punishment for an unsafe release in qualifying is usually a financial penalty imposed on the team, if they are found at fault for releasing a driver into the path of another car.
The FIA applied the same logic to McLaren, though doubled the fine to €10,000, citing the view that this incident warranted a more severe penalty.
Despite the incident, both drivers made it into Q2, though ultimately Verstappen could only muster a lap good enough for P7 whilst Piastri qualified behind team-mate and pole-sitter Lando Norris in second.