NEXT time you attend a sporting event, be careful what you yell out, or you could find yourself being put to the test in the thick of the action.
That's exactly what happened to Irish fan Chris Quinn at Wimbledon.
The heckler was heard instructing former world No. 1 Kim Clijsters where to place her serve during the women's invitational match involving Clijsters and partner Rennae Stubbs against Conchita Martinez and Andrea Jaeger.
Clijsters and her Australian doubles partner were leading by a set and locked at 4-4 in the second. The Belgian was in discussion with Stubbs on whether her next serve should be placed "wide or down the middle", when Quinn shouted from the stands for Clijsters to send her next serve "to the body".
Following the coaching from the stands, Clijsters beckoned the Irishman on court and gave him the opportunity to back up his words, by facing the Belgian.
But to add to the impromptu fun, Clijsters ensured that Quinn was not in violation of Wimbledon's strict all white clothing rule, fetching a spair skirt from her tennis bag, that was clearly too small for the portly fan.
"This isn't going to work," the commentator said. "They're not going to get over the knees.
Oh, my goodness!, I really hope we don't get a camera shot from behind."
Quinn somehow managed to get the skirt around his waist, much to the delight of the Wimbledon crowd, and Clijsters, who fell to the grass court in a fit of laughter.
Surprisingly Quinn did managed to return the first serve of the Belgian legend, however didn't have as much luck of his next two efforts.
"That's a man, in a skirt, trying to return Kim Clijsters serve - it's 2017 people," the commentator said. "They've completely forgotten there is a tennis match going here."
Clijsters and Stubbs went on to beat Jaeger and Martinez 6-2, 7-5, despite the interruption from Quinn.
Thank you for going easy on me with the serve. You have made me a bigger hero to my 3 daughters who worship you BTW.— chris (@chrisquinnirl) July 15, 2017
Quinn later thanked Clijsters, on Twitter and is clearly enjoying his moment in the sun alongside some tennis greats.
Well its not everyday I get to share Wimbledon headlines with roger federer. I'll take it!!— chris (@chrisquinnirl) July 15, 2017
'Will teach me to open my mouth again. They were awesome. And I got to play in Wimbledon. One off the bucket list," Quinn tweeted.