Sometimes, you back up towards a wall a bit too fast, and you hear a crunching sound. This is a *bad* sound; the kind that makes you grit your teeth a bit and hunch your shoulders.
In this case, the crunching sound was cover of my left tail light cracking. Unfortunately, it seems that upon investigation, not only does Mazda not sell the cover of the tail light (It only comes in one piece) it is also nearly 200 dollars.
At least it was easy to replace.
Step 1: Open the trunk and remove the bed cover
Open the trunk. There will be a felt-ish cover over everything. Pull it back to reveal the bolts for the tail light assembly.