“It is Veritaserum - a truth potion so powerful that three drops would have you spilling your innermost secrets for this entire class to hear,” said Snape viciously. “Now, the use of this potion is controlled by very strict Ministry guidelines. But unless you watch your step, you might just find that my hand slips right over your evening pumpkin juice.”
this is so funny
He always tries so hard to look bad and menacing, but then he outdoes himself with the results.