http://www.astro.com/cgi/atxgen.cgi?btyp=apx;cid=mobile-e6lfilechcXJC-u1368729370;pa=mobile&lang=e&nhor=4#B13
This is my mum's natal chart - she was born around 6am - we are not entirely sure of the minute.
She is a Virgo sun, with apparently a Virgo Moon and Ascendant. She isn't at all sarcastic - she has a more jolly, even eccentric, sense of humour and mannerisms, perhaps like that of Sagittarius.
I would expect one with such a combo to be as sarcastic as humanly possible, but is this primarily down to her Mercury in Libra?