Even if we kept everything very similar to the PT, this is a scene in my head that could be placed in the Episode II timeline and captures Anakin's curiosity and growing power: he and Obi-Wan are in a battle, let's say on Utupau, on a ledge fighting off a dozen battle droids. As Anakin knocks two droids back with his lightsaber, their blasters go off and the shots hit the rocks above Obi-Wan's head. Seeing the danger, Anakin force-pulls Obi-Wan out of the way just before the large rocks smash the ground where Obi-Wan had been standing. Anakin then brings his hands in towards himself, and emits a double-handed Force-push (the motion would be kind of like a Ryu fireball in the Street Fighter video game). It knocks all remaining battle droids back, shattering them. He stares at the broken pieces with a mix of joy and awe on his face, as this was the first time he had made (or Obi-Wan had seen) a Force-push of that magnitude. Obi-Wan gets up off the ground and scolds him for breaking my new Jedi rule #1: never use Force powers on another Jedi, and #2: always keep control of your emotions.
This made-up scene accomplishes several things. 1) Anakin is dangerous because he has greater power than most (or all) other Jedi and he's curious about pushing his limits; 2) He let his emotions take over and disobeyed tried and true laws of the Jedi; and 3) The audience sees that he has power beyond his control, but it is being used arguably in a good way (as opposed to murdering women and children). We still like him, but we're also a little fearful of him.
To GL: this is a subtle thing we like to use in writing called "foreshadowing".