Thanks for bumping this thread.  I was checking out the new Qdoba Mexican Grill (so sue me) near my office yesterday.  About half way through the bowl, I noticed that my tortilla soup* was lacking something-- tortillas to be exact.  I considered getting up and walking my tray back to the counter, but it didn't really seem worth the bother.  But then a sweet young thing with a pierced tongue who was clearing off tables stopped by, made eye contact,  and said "Is everything all right with you?" 
    I was so startled by the open-ended question that I asked if perhaps my tortilla soup was supposed to have tortillas in it.  She said, very forthrightly,  "I have no idea" and said she would check,  was I asking for a side order of tortilla chips?  She  was interrupted by the man at the next table, who turned out to also work there and who instructed her to go ask for a side of sliced tortillas for me.   She came back with them.  I put them in my soup.  All was well.
     It was a better level of customer service than I've gotten from  many a sit-down restaurant.  Very smart management move, to have a person who's already circulating also solicit 
 real feedback.
*Not the worst tortilla soup I've had on my loop block.  That dubious honor would go to another new restaurant, the Elephant and Castle at Wabash & Lake.  They had tortilla soup as their soup of the day.  I ordered it.  It looked like Elmers Glue, thinned with a little grey water, with a few unidentifiable green lumps in it.  It tasted worse.  But I figure that's one of those situations where I'm to blame as much as they.  What was I thinking?