For all we know, Chris has snapped, many times in the past, and we just don't know about those episodes. Him smashing the bathroom walls with his fists and head because he didn't like pony changes is one thing we know about, only because someone asked. Chris could have multiple episodes in stores that just get written off, and he's certainly not shy about popping off loudly in public.
I don't think there's going to be a big huge freakout, where Chris goes on a rampage. More likely his first night home, in an empty house, with no Barb and no future with the house is really going to do it.