It was really not to be funny, but pure good old intense hate out there on court, Nadal was pissed of because of something and showed he was about to serve in a kind of offensive way probably because Söderling complained about it before. Söderling paid it back by picking his ass like Nadal does and make Nadal wait for a long time to serve. No player laughted, they were both pissed of at each other. I was really shocked.
Here is the video:
Söderlings comments in swedish media:
" I just had to do it. All the players complains about how often u have to wait for him. Now he had to wait for me once, i probably waited for him 200 times, and he made fun of me. Even if it doesnt belong to tennis what i did i think he throws mountains in a glass house."