McLaren's pit wall was reminded during Sunday's Italian Grand Prix that engineers should preferably speak to Lando Norris only when they are spoken to.
At one point in yesterday's race, Norris' race engineer cued his communication to his driver as the latter was involved in a high speed overtaking move overtaking move on Toro Rosso's Pierre Gasly.
A few seconds after delivering the message, the engineer was given an earful by the 19-year-old.
"Stop f**king talking when I'm trying to race!" quipped the hard working Norris.
The flaming was heard loud and clear, and perhaps even raised a few eyebrows on the McLaren pitwall as the outburst was fairly untypical of the affable but usually courteous teenager.
At the end of the day, Norris secured the final point in the race results, and that was all that really mattered, although he was hoping for more.
"A decent race and a point is alright considering where I started, but you always want a little bit more," said Norris.
"We got a bit unlucky: we boxed, we had the undercut on Perez, but then the Virtual Safety Car came out and he got a bit lucky to stay ahead and went on to finish in P7.
"I’m not suggesting we definitely would’ve finished there, because I think they still had better pace than us, but we could’ve finished better without the VSC. I
"In the end, I didn’t think we had all the pace but we hung on, managed to finish the race and got a point – which was a good thing after last weekend in Belgium."
Here's the clip of Norris' uncensored rant from F1 TV.