Nice. I liked it so far. Just a little nitpick. Should the mom's speech bubble in the last panel be dashed? I think that usually denotes a whisper. As far as I've seen, a normal bubble without a speech line would be fine, especially since the character refers to the speaker as "mom" in his next line.
EDIT: Curse my inadequate monitor! Does the character's last bubble say "I shouldn't have played WoW last night"?