Who?

I was thinking of some friends I hadn't talked to in a while so sent a few texts the other day to say hi, all the while wondering if their number might have changed...

Then I took a scroll through my phone's contact list and found myself more than once having absolutely no idea who a person was.

Like, Ben?  Who is Ben?  How do I know Ben?  Or when did I know Ben?  I really can't think of anyone called Ben but at some point I put his number into my phone?

There was another name or two like that, while most I could associate with a person or something, there are some I just have no idea who they are, were, or anything at all.

Sorry Ben... I hope you're well? 

(Do I deleted the unknown numbers?  I guess?)