Fans witnessing their team lose 4-0 is never an enjoyable experience, but it is even worse when their former striker is the one to rub salt into the wounds.
For Everton supporters, they had to watch Romleu Lukaku score the third in a late goalfest for Manchester United at Old Trafford on Sunday.
The Toffees sold the Belgian international in the summer transfer window, and even though they spent more than £100m on new signings, they failed to replace the prolific forward.
The gulf in attacking talent was evident at the weekend when the Toffees failed to get a goal over the line.
Ronald Koeman's men have lacked that clinical touch all season, and in their last three Premier League defeats, the club have conceded nine goals and not scored any at the other end.
Lukaku, who nabbed 25 goals for the Toffees last season, already has a tally of six to his name, and the most recent one was against the striker's former club.
Some players opt against celebrating against clubs that they have previously played for as a sign of respect, but Lukaku did the opposite as he appeared to goad the travelling supporters by cupping his ear.
Many have suggested that it was the Belgian's reaction to some earlier booing that he received in the game.
Plenty of Everton fans were angered by the 24-year-old's celebration.
https://video.footballfancast.com/video-2015/PL25(99-00).mp4