Apparently this came out in 2009. Super hot chick, Tania Raymonde farts hiding in a stall in the boys bathroom.
http://www.youtube.com/watch?v=WGXBVwqmQZQ
And here's a bonus:
http://www.youtube.com/watch?v=CmhFCnf0PHk
One more. Feeling generous:
http://www.youtube.com/watch?v=SzUL7TVECB0