As Jason Sancho's finger hovered over the send button, you wonder whether a second thought was given to what he was about to do and the potential ramifications that now lie ahead.
Just over an hour after Erik ten Hag had sat in the Emirates press room and said the £73million winger didn't merit a place in his 20-man matchday squad because of his form in training, Sancho took to social media to offer a rebuke.
It was astonishing stuff. Sancho won't need reminding of what happened to the last player who issued unauthorised comments questioning the integrity of his manager at Old Trafford.
Cristiano Ronaldo's interview with Piers Morgan might have been more incendiary, and more pre-planned, but United took action within days and the Portuguese star was always going to face disciplinary action.