lol, in this country.. america.. one can sue anyone for any reason at any time.. u just need to convince a judge or jury (wonder how popular the frenchman will be to a US jury)

Someone once sued mcdonalds for their coffee being too hot.. lot of bored, out of work, lawyers in the US.

So if you really lost money with them i'd find the US entity they transact with and just call a lawyer up in their state and ask for a free consultation.
If you are smart you dont even need a lawyer really you can just do it all yourself and start filing subpoenas with the county clerk for 25$.  It's up to their lawyer to contest your subpoena.

Get a court date set, and subpoena everything you can.

Oh and by the way, I'm sure there were plenty of lawsuits about the flash crash in may.. yer a deluded if u dont think that.

The above is NOT legal advice, consult your own lawyer to see how you should proceed with your individual situation.

http://www.vanosteen.com/mcdonalds-coffee-lawsuit.htm   - they wont 2 mil+ on it
http://money.cnn.com/2003/01/22/news/companies/mcdonalds/ - lawsuit blaming mcdonalds for 'making them fat' haha they lost that one

god bless america