After 16 laps, during an attack, Vettel hit a slippery spot, spun around, and harpooned Button's car, knocking Button out of the race and himself out of contention.
These reside at the sides of the T in the tri-spoke wheel so you won't accidentally knock a button and change the CD track.
Sometimes I actually sprint for the off button, knocking toddlers aside to get there.
The first safety car was employed on the opening lap after McLaren's Jenson Button knocked Sergio Perez's Force India into a spin on the exit of Mirabeau.
But I happened to hit him on the button and knocked him out".
Vettel also topped the second session, where both Hamilton and Alonso managed to hook their cars up better but where Button was knocked out.
Their car and its Honda power unit has been way off the pace all season and they had qualified 17th and 18th on the grid, ahead of only the two Manor cars, and in the race Jenson Button was knocked out on lap one by his team-mate Fernando Alonso.
The minié ball that knocked him down fractured the button, dissipating enough of the bullet's force to prevent it from penetrating too deeply.
But while their new driver Sergio Perez stayed on them and was knocked out in the second session, Button decided to come back in for intermediate tyres.
This was done because the alarm button had been repeatedly knocked by people walking through the door, triggering a false alarm.
