He wants his meaty bone. He's only allowed it outside. So he's going out (it's raining), picking it up, and asking to come back in. Then he drops the bone (as he knows he can't bring it in) and comes inside. Immediately looks around for his bone, remembers it's outside and starts all over again. About a hundred times so far...
I could just not let him go, but the expression on his face is worth it!