Next thing you know we'll be Penny Arcade.
If you have to apologise for a strip, you should probably just not write it in the first place. And explanation belongs within the strip itself; if you can't provide sufficent exposition with contextual clues and narration, a three-panel comic strip might not be the ideal medium for telling your joke.
What I'm saying is everyone should do what I do and surreptitiously include apologies and explanation in their titles.
But put me down as being opposed to any feature that allows anyone, author or readers, to attach comments to a comic.
P.S.: I dislike the graphics in Akirajim's sig.
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The what mentioned above is total fiction. Please don't take it seriously!