For the record, my French skillz eventually proved valuable when we were in Ireland and attempting to determine the dress code for one of the links courses there (golf), and the only golfers we ran into were French and drunk at a pub.
One thing I remember in particular from my 4 semesters of French, was Dr. Yvette Guillemin-Young's,
When someone tells you something that's complete hogwash, this is an appropriate gesture while saying, "Mon œil!" or "As if!" or "Whatever dude!" or "Pfft" or "Yeah right!" or "BS!"
You've always wanted to know all about French gestures and how to use them. N'est-ce pas?
Voila:
http://french.about.com/library/weekly/aa020901a.htm
[where: Minnesota, Food, Minneapolis, Twin Cities, 55418]