This is why. Poor Ander Herrera.
The best bit about Gerrard's short showing in the Liverpool-Manchester United match? Twitter took about the same amount of time as he was on the pitch to produce this heatmap.
It's impressive, but not even close to being the fastest red card ever. That accolade belongs to Cross Farm Park Celtic striker Lee Todd, who was sent off two seconds into a game in October 2000 for foul language after saying of the referee's whistle"f**k me that's loud".