If you drop a frog in a pot of boiling water, it will of course frantically try to clamber out. But if you place it gently in a pot of tepid water and turn the heat on low, it will float there quite placidly. As the water gradually heats up, the frog will sink into a tranquil stupor, exactly like one of us in a hot bath, and before long, with a contented smile, it will shoot you in the face with a fireball.
Because frogs are all evokers, and they just need a few rounds to get their defensive spells up before they start some shit with a motherfucker trying to boil them.
(With apologies to Daniel Quinn.)