and, on that note what a shame it is that Mr. Leary has seemingly given up Comedy for Acting. :(

That song pre-dates halo.  
The Asshole Song was the first track on that Comics (e.g. Denis Learys’: No Cure For Cancer), Album which was released way, way back in 1992.
 
Halo came out when like 2002?

I love that song back when it came out on Halo.

There’s not a damned thing anyone can do about it. You want to know why? Because we got the princesses, that’s why! Two words: Magical Fucking Alicorns, OKAY?
 
Star Swirl ain’t dead, he’s frozen! And when we find a cure for old, we’re gonna thaw out the Bearded and he’s going to be pretty pissed off. You want to know why? You ever taken a cold shower? Well multiple that by 15 billion times, that’s how pissed off the Bearded’s gonna be.

This made my day.
 
I’M AN ASSHOLE