I'm not sure about giving two weeks notice.
What aren't you sure about?
I think giving two weeks notice is a waste of time.
Sometimes circumstances make it impossible for us to give two weeks notice before leaving a job, but we should try to do so whenever possible. When we leave a job without giving adequate notice, it makes it harder for our boss to train a replacement for us and we could risk getting a bad reference.
Yeah but I don't care about that.
Still, I think it would be good if you gave two weeks notice, assuming you're able to. It would reflect poorly on you if you didn't.