Sarah Silverman Burns Mississippi

7/27/2009 1:10 AM PDT
Sarah Silverman is always down for a scholastic challenge, but when we hit her up with an impromptu spelling test at LAX this weekend -- someone forgot how many crooked letters it takes to spell Mississippi!

She did spell it correctly the second time around -- but 13-year-old Kavya Shivashankar didn't need a second chance when she locked down the Scripps National Spelling Bee championship back in May ... and her word was "Laodicean."