In addition to being a well respected referee in Germany, Bibianna Steinhaus has also become a beloved figure for her sense of humor on the pitch. She became YouTube famous in 2010 when Hertha Berlin defender Peter Niemeyer accidentally swiped at her chest while trying to give her a pat on the arm and she responded with bemusement.
During Tuesday's match between Stuttgart and Augsburg, Steinhaus was serving as the fourth official, which had her stationed next to Stuttgart's Cristiano Molinaro when he came on as a halftime sub. As players tend to do, Molinaro adjusted his kit before entering the match, which involved standing there with his shorts around his knees. And either something Molinaro said or something he did prompted Steinhaus to burst into laughter.
Judging by those images, anyone sitting behind Molinaro probably did the same thing.