At times you have to feel for referees.
Despite improvements in goal-line technology and extra officials on hand to help them out, judging whether or not a player is trying to deceive them to win a decision can be very difficult.
You can almost understand their frustration.
With that in mind, have a look at this vine.
Referee Andre Marriner has taken charge of Everton's goal-filled meeting with Sunderland at Goodison Park.
With the home side's Gerard Deulofeu clearly unhappy with Marriner's failure to award him a penalty, the camera switches to the referee.
The lens is barely trained on him for a couple of seconds, but some appear to think that Marriner can be seen mouthing the phrase "f**king cheat".
We're not sure... what do you think?
It seems quite a few people noticed it, too.
https://twitter.com/Mr_CallumWright/status/660831476502630401
https://twitter.com/ricky9er/status/660831872226865152
https://twitter.com/SHEZZATHE3RD/status/660834945133359105
