Haha I see what you mean! However, most people define happiness as the presence of joy or other pleasant emotions, but all emotions come and go, just like everything else. For that reason, happiness in that form is not available on a continuous unbroken basis. But what if that's not what true happiness is? What if happiness is simply the end of unhappiness? In other words, "peace of mind". The absence of things like guilt, blame, pride, worry/anxiety, expectations and attachment to outcomes? The end of a narrative that claims ownership over everything that happens and has ideas about how life should and shouldn't be. That type of happiness is available on a continuous basis. And I get the sense that this is where Rupert is coming from.
Well, that's my two cents anyways! =)