In the OotP movie ? I don't think so. Severus could not obviously tell, in front of Umbridge, he had understood ! He was a master spy, he knew how to behave in such a situation.
AND...Severus HIMSELF told Sirius to stay put in Grimmauld Place! He was depending on Sirius to tell Dumbledore what had happened, but instead, Sirius went to the Ministry, and left Kreachur to tell Dumbledore, and that was when Kreachur betrayed Sirius.
I really, honestly, don't know. I don't really have a "least favorite" because any time he comes on screen या is seen on the page I am listening या पढ़ना intentlly.
Really my "least favorite" moment is when he kills Dumbledore, not because I thought he was bad for doing it, but because it caused him so much pain.
My least प्रिय कोट्स arent द्वारा him, but about him, and they usually come from the people who insult him.