Damn. Has it really been that long?
It's easy to dismiss Professor Oak as a doofy academic who can't even remember his grandson's name. But originally, Pokémon Red & Blue designed Professor Oak as a powerful trainer the player could face off sometime near the end of the game.
Oh. My. Goodness. You thought Pokémon was safe and all? Ha! Just look how Charmander gets jacked up and starts screaming like bloody hell.