The ticking also ended with the sound of a gun being cocked.
Hmm... I'm going to have to watch it again, but to me it sounded like a camera...
Anyway, the bedroom scene was fantastic. You could see on Skyler's face how she was beginning to understand that Walt isn't just a criminal, he's like a master chess player when it comes to comes to crime. And oh my god the audacity of Walt strolling up to her at the end of the episode and more or less saying, "I'm going to manipulate you into liking me again."
