Sebastian Vettel lost his cool while the Azerbaijan Grand Prix was under a Safety Car period this afternoon, handing back to Lewis Hamilton what the German saw as a deliberate brake test.
Hamilton was slowly leading the pack behind the Safety Car out of Turn 16 when he appeared to suddenly slow, surprising Vettel who punted the back of the Mercedes.
Fuming, the German then pulled up alongside Hamilton, gesturing furiously and hitting briefly the right from of the Brit's car.
"He brake tested me. What teh hell is going on!" quipped Vettel on the radio.
"Vettel literally just turned into me and hit me," was Hamilton's response.
The incident was immediately investigated by the stewards, and after much debate they ultimately hit Vettel with a 10-second 'stop and go penalty' for dangerous driving.
Regardless of the consequences in terms of points, the bromance between the two drivers will certainly suffer a set-back!
GALLERY: F1 drivers' wives and girlfriends
Keep up to date with all the F1 news via Facebook and Twitter
LAST CHANCE to enter our ULTIMATE TRACKDAY competition! FREE ENTRY HERE!