Pro tennis' reigning bad boy copped a stiff fine for yet another instance of naughty behavior.
Cameras caught the obscene gesture from start to finish. Watch it below, if you feel the need:
It wasn't the only time the Australian played between his legs during the Wimbledon warm-up tournament. Watch him hit two tweeners—one of which is wholly unnecessary—in the same rally during his match against Andy Murray.
On the other hand, Twitter users seemed to appreciate the footage.
Apparently, that's the one shot he shouldn't have taken.