Rocket Claw

Though Megatron's most iconic weapon is his Fusion cannon, is is far from his only means to destroy foolish Autobots and puny fleshlings. He also has a Rocket Claw, which is like a regular claw, except... Well, umm... It can stop being a claw, by transforming into a flail/whip weapon. Having "rocket" in its name seems to suggest he could launch it with explosive force, but he's never been shown doing that. Well, knowing him, Megatron's probably so packed-full of weapons that there's no time for him to use them all.