Huh.
I just noticed this on my Delta account...
26 Sep 2011 Audience Rewards Activity Date : 15 Sep 2011 200 miles
Not sure what that's all about -- I see 4-5 instances of 2pts at a time when I did the trivia before, but I never saw a 200 point/mile question, and I don't have any other Audience Rewards activity on 9/15...
But as an Amex CSR once told me, "We won't look that gift horse in the mouth"!
PS: Thanks all for your help with these!