What is this that roareth thus? Can it be a Motor Bus? Yes, the smell and hideous hum Indicant Motorem ***! Implet in the Corn and High Terror me Motoris Bi: Bo Motori clamitabo Ne Motore caedar a Bo--- Dative be or Ablative So thou only let us live:--- Whither shall thy victims
Is an expression of surprise, irony, or incredulity - "can" means more than possibility; you know very well what it is. It is often used with very young children, to get them excited about what they are seeing.