[SurfersCreed]

To really do a 'Rambo', he needs to sabotage some cameras so BB can't follow him.
Then he can start terrorizing the HM's - peeing in Dexter's makeup bag, wanking onto Charlie's pillow, etc.

"This is Big Brother. Will Callum please come to the diary room."

Callum, wearing nothing but a thong and mud camouflage, dramatically rises out of the pool and grimaces at one of the remaining cameras.

He runs into the house and hurls himself through the 2-way mirror into the BOTS studio. Rylan cowers in terror behind a terrified audience member as a near-naked, mud-covered Callum screams "Ask me how I feel! Ask me how I feel!"

"Calm down Callum, tell us what's your knatter?" AJ squawks patronisingly.
Callum puts his fist through her face ("THAT'S my knatter, biotch!") and starts destroying equipment, end of Rambo 2 style.

Actually, I'm surprised that he hasn't 'snapped' yet.
He seems like a man on the edge. Perhaps Charlie's betrayal WILL be the final straw!