By Andrew Gould The life of a star athlete is often strange. You go to work with thousands of paying customers cheering, jeering, and scrutinizing your every move. Then sometimes you go for a nice stroll in another country and encounter a fan with your face on their socks. That’s precisely what happened to J.J. Watt. On Sunday morning, the Arizona Cardinals star pass-rusher posted a photo with a fan he encountered on the streets of London. She rolled up her pants to reveal the special footwear featuring his likeness. “Wasn’t sure what to expect at that moment,” Watt wrote on Twitter, “but my o…