At a previous place I worked at, one day somebody says from the other direction "you know Jo-Jo?", and I had to wonder what on Earth this guy was talking about. Well Jo-Jo was a nickname for his grandson, and he worked with me. So later that day he just happened to be working and I go "Hey I met your grandpa", and he immediately denies that was his grandfather. I didn't think much of it, maybe a family friend who they call grandpa or something... no that's not the case.
Well Jo left the place for good, but later some people told me that he would almost always be out on Sundays. So for a period of about four months, all four grandparents had "passed away". He also said he had to go to the hospital for a panic attack, and came back totally fine the next day. He also said his mom kicked him out of the house with nowhere else to go. Turns out they were all lies so he could stay home on Sundays to watch football.