A would-be thief learned the hard way that you don’t mess with tennis star Serena Williams.

The 34-year-old athlete shared a story via Facebook Wednesday proving that she can be a bad ass off the court too and why she really is “SuperSerena.”

“Soooooo yesterday at dinner the CRAZIEST THING happened to me,” she wrote. “I was sitting enjoying some Chinese food (delicious may I add) and this guy stands next to me. It was only 2 of us sitting at a 4 person table just chatting like we have not seen each other in years. Anyways I digress, so this guy is standing next to me and something (I have now dubbed it my SUPERHERO sense) told me to watch him. My phone was sitting in the chair but I just didn’t feel right.

“He was there too long. 'Is he a customer?' I thought 'Is he waiting on the bathroom?' nonetheless I tried to shake his this eerie feeling. However, I kept watching him from the corner of my eye. Then when least expected low and behold this common petty thief grabbed my phone and swiftly left.”

Williams went on to explain that she shouted about him taking her phone, but then her “superhero” took over and she chased the thief. After years of being at the top of the game in her sport we already know she can run and that this probably wasn’t going to turn out good for the crook.

Williams said that she caught up to him and calmly asked if he took the wrong phone by mistake. After a moment, he apparently lied and told her that he did. She thanked him and then took her phone back.

“Superhero? Maybe? Or HELL YEA!!” Williams concluded. “I’ve got the speed the jumps, the power, the body, the seduction, the sex appeal, the strength, the leadership and yet the calm to weather the storm. Always listen to your superhero inner voice. Always keep your things close! Fight for what’s right. Stand for what you believe in! Be a superhero!”

And that’s exactly why you don’t mess with SuperSerena.