Heckling is something that most professional athletes have to deal with -- especially in a game like tennis where the audience is kept so quiet that a single comment can be heard throughout the stadium.
Such was the case at this year's U.S. Open, where Australian Bernard Tomic lost his cool during a back-and-forth with a heckler. Tomic said he had been dealing with rude comments from the crowd on both sides of the court before he finally had enough.
Among more savage vulgarities, Tomic said to the man:
"I will give you some money to make you feel good, peasant. Why don't I give you 100k to make you feel good? You're a peasant. You've got nothing in your life ... nothing."
For his harsh response, Tomic was hit with a $10,000 fine by the ITF, more than tripling any of the other 15 fines handed out so far at the U.S. Open.
"He definitely baited me the whole set for me to say that, but I do apologize if there were people around that heard," Tomic said after the match.
It didn't help that Tomic, the No. 17 seed, was trailing at the time and ended up being upset in four sets by Damir Dzumhur.
Tomic's fine isn't the largest fine handed out at a Grand Slam this season. Heather Watson earned a $12,000 fine for smashing her racket at Wimbledon earlier this year.
A Wimbledon rant by Viktor Troicki in which he called the chair umpire an "idiot" and said he was "the worst ever" got him a fine of $10,000.