I was walking through the Johnson Center behind a group of young men. One of them looked somewhat familiar. He turned, saw me, did a double take, then smiled.
"Hi!"
"Hi!" I replied, frantically searching my memory for his name and the context in which I knew him.
"I know some people you know!" He said.
"Oh really?" I asked, relieved to be off the hook, "Who?"
He told me who he knew and then paused for a minute, still grinning.
"Ha, sorry," He said, half apologizing, half laughing at the situation, "I guess that was kind of weird."