Love the concept
Though I've never personally seen students argue about the finer points of the English language over lunch before, this is a great laugh. The characters have developed well and I don't think they're completely done yet.
The retarded kid jokes are the same sort of thing we see in 'House' and other such American dramas now, where no-one's afraid to push the boat out just a little - something I feel society lacks now, keep that up.
$30 for a new girlfriend, sounds like a deal to me.