Social Alzheimer's

Social Alzheimer's is when a person with in a group that knows everyone acts as if they have never met them before after a period of being apart from the group. (Examples: work group,friends,team,ect...) separation time can vary in lengths anything form a day to a week, month, ect.....

Abbreviation: SALZ

How come on every time we come back to work Chris always acts like he doesn't know us on the first day?
That's because he has social Alzheimer's.