Luigi's Nemesis 2007 March 31

And so it began. Well, not really. I just made this comic for fun, with no intention of expanding on the concept. But here we are either way.
It all started when I started wondering about Waluigi's character. We assume he might be a rival of sorts to Luigi, but there's absolutely NO in-game reference of that. Or even that he can fight. Or anything. He's just Wario's sidekick at times. It's like, I dunno, assuming Daisy is Luigi's equivalent to Mario's Peach. Just silly. Still, I really like the coloring in this one. Mario's clothes specifically. In fact, I really liked that last panel, visually at least. Here's a bigger version for your enjoyment. Haha, Luigi is owning his brother at poker.

Can anyone guess what song Luigi is whistling in the first panel? C'mon guys, it's pretty obvious.