Grool wanders over to see what these cavepeople are doing to the big big smelly bang thing. What they do with stuff? Grool happy to find more cavemen. He grins and drools and stutters "Grool! Urggha mug bumggrah! Smelly?" and shambles over towards the caveman with the stick that has pointy thing on it.
"Grool uggha dool? Murg, Grool thooka dak!" He points to himself and Murg, then pantomines smashing the big big smelly bang thing - like Murg is doing right now.