What the hell is going on here?! James Franco and Seth Rogen are up to some serious Naked and Afraid sh*t, as James' Instagram reveals.

The wacky actor has teamed up with his Pineapple Express pal for a Survivor-type experience, it seems. Franco Instagramed three shots of a wild, wilderness trip with an equally-nude Rogen -- the pair dancing in a field, hiding under a tarp, and posing (full-frontal) with burlap messenger bags at their sides. So just what does all this mean?

With James Franco, you never know ... and he's not giving too much info in his photo captions. Just:

    Boom boom, NAKED and Afraid. Me and Seth, in the bush, naked, together. For reals.
    See if me and seth can make it, NAKED and AFRAID!!!! Wtf?! You'll see........
    Just survivin', Naked and Afraid. This is how we do. @sethrogen