If a job is so bad that I see no recourse other than leaving, two weeks notice isn't going to happen. I'll leave whenever I feel like it and I won't tell a sin

If a job is so bad that I see no recourse other than leaving, two weeks notice isn't going to happen. I'll leave whenever I feel like it and I won't tell a single soul other than HR as I walk out the door. This is my life and I decide what happens. Now, if I don't need to vote with my feet then courtesy certainly prevails. I don't need to tell my boss that I'm looking at other opportunities. Now, if I happen to mention that Google called and expressed interest in me, my boss has an opportunity to let me know my value. I can also return the favor and let my boss know that I turned down an opportunity at Facebook. Communication is key, but don't give up a strategic advantage by blabbing.