Boxed macaroni and cheese is a rite of passage. If you didn't eat it as a young 'un, you're probably not American.
I'm pretty sure it was the first thing I ever cooked on my own, with my tiny apron, and my tiny step stool, and my tiny fire extinguisher. And even then, I messed around with the ingredients. Growing up in a sparsely stocked kitchen (yeah, we were poor) meant making do with what we had. Sure, there was a #failplate or two (Spam + Twix comes to mind), but things came out pretty good for the most part. Even though I'm rich now (compared to 7-year-old Perry) and don't have to eat Kraft dinner, I still do, I just eat more. Yes, that was a reference to the Barenaked Ladies... so I guess Canadians get it, too.