We need to talk about “Grandpa.”
“Grandpa” is the third episode of the new, 30-minute HBO version of High Maintenance, the terrific web series that details the exploits of the Guy (Ben Sinclair), a weed deliveryman in Brooklyn. Actually, that’s not quite right—High Maintenance is about the various people the Guy crosses paths with, from his customers to their neighbors. The Guy flits in and out of each story, but is rarely the central character…