You know, Brad and DexX do kind of look like the Mac and PC guys.
The comic is okay. The idea is funny, but the execution is a little flat. The dialogue strikes me as unrealistic, and you could do more with the last panel: okay, he's in hell, but what if he cracked a joke about being in hell, or what if the demon came up with some kind of ironic torture for him?
Not a bad start, though; welcome aboard, and keep at it.
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The what mentioned above is total fiction. Please don't take it seriously!