A wild Brazilian Grand Prix was sent into complete bedlam when Charles Leclerc and Sebastian collided, leaving Ferrari with a double DNF.
Acrimony has bubbled under the surface at Ferrari for much of the season as Leclerc looks to put his stamp on a team that Vettel has led since swapping Red Bull for the Scuderia in 2015.
It came to the fore at Interlagos, giving the end of the 2019 season a major talking point.
It's not the first time team-mates have collided in F1 - it's not even the first time Vettel has collided with a team-mate in F1!
F1 ran through 10 of the most high-profile intra-team collisions.