Something's Missing

Joseph Heller wrote at least two great novels; the other one was "Something Happened." I'm thinking of writing my own variation entitled, "Something's Missing." I don't know what, and I don't know how or why, I don't know what; I just suspect there's something important that is "not there." I mean something really important. I mean, something really, really, really important. I don't know what, I don't even suspect I know what. It's missing, and I know I'm missing it, but I don't know what it is... The only clue I have, I wake up, I start going through the motions of a day, I do all the things I do, that I must do, and this sentence pops into my head: "This can't... be it."