When a situation changes from the tame and quotidian to the unfamiliar and hazardous, shit gets real. Shit getting real can lead to unexpected and potentially life-threatening consequences. If you believe shit may soon become real, the best thing to do is to get real yourself by staying calm and maintaining an awareness of your surroundings.
"I noticed the guy walking behind me for several blocks was starting to close the distance between us. I made some unusual turns in an attempt to shake him. But he was still following, and was now in spitting distance. And then shit got real."