Separated at Conception: Robert Stacy McCain and...?

 Robert Stacy McCain, college during the 1980s, excessive alcohol use, and the occasional experimental use of certain forms of fungi...

RSM, the forgotten years
before the fedora...
(this is a photoshopped 
recreation of RSM's 
forgotten years)
Updated actual photo below...

Barrett Brown, 
conceived circa November 1980

@msebl You do know that that's a PHOTOSHOP, right? @bobbelvedere @smitty_one_each
— Robert Stacy McCain (@rsmccain) September 17, 2012

@rsmccain @bobbelvedere @smitty_one_eachStacy, the whole post is a parody.
— Evi L. Bloggerlady (@MsEBL) September 17, 2012

Update:
RSM in the day...