Ten Results from a Google Search of 'Twenty Eight Francs'.

* I don't know. It was just something that popped into my head. I started with yen, but liked the results francs brought better. Pesos all came back to Mexican politics, which is all well and good, but I was after variety. Marks brought up people named Mark and that was too far from the mark. I am sticking with francs—I don't believe any Franks will come up, but you never know.

1. A Wikipedia article about the movie 28 Weeks Later, a sci-fi, horror, post-apocalyptical movie about a virus that infects Britain and what happens twenty-eight weeks later. Britain is close to France, the protaganist's children were in Spain during the infection and Spain is close to France, but I don't see where the francs come into it.
2. A Wikipedia article on the 1927-28 Waratah's (the rugby team from New South Wales) tour of the British Isles, France and Canada. Easy, they would have spent some francs when they were in France.
3. A document about the 303rd BG (H) Combat Mission No. 129 whose mission was to bomb the Chartre Airdrome on March 27th, 1944. There were twenty eight planes. Perhaps they carried francs in case they fell or were captured. It does have some nifty maps, and some flying configurations. And then you remember that it was real and people came back deceased, and then its not so amusing.
4. The Internet Movie Database's synopsis of the sci-fi, horror, post-apocalyptic movie 28 Days Later. Oddly this is a virus that infects Britain. It is called the 'rage' virus which is weird because that is the name of the virus in the movie 28 Weeks Later. But this must be a stronger strain because the protaganist in this movie wakes up after sleeping for 28 days (wish I could) to find no-one. Of course, though, there are zombies to fight and non-zombies to find. Who says there are only ten plots?
5.Day twenty-eight of a blog entitled 'Our Summer in France'. The blogites are travelling from Paris to Dijon on this day. There are adventures and mis-adventures and poops. They would have spent francs to buy their morning raisin swirly things.
6. A SciVerse Science Direct Database journal on the 'Determination of twenty eight biogenic amines and amino acids during wine aging by micellar electrokinetic chromatography and laser-induced fluorescence detection'. I would have read it, I would! But, you know, I had some socks to fold, and I was writing a thesis, and Lollipop made some nice smells. The abstract mentioned French wine—the link. And they seemed know what they were talking about as they were describing how all the grapes were grown in the same 'wine yard'.
7. A Google Books link to Honor de Balzac's Lost Illusions, which has the following quote on page 391: Suppose that in a large banking-house a bill for a thousand francs is daily protested on an average, then the banker recieves twenty-eight francs a day by the grace of God and the constitution of the banking system, that all powerful invention due to the Jewish intellect of the Middle Ages, which after six centuries still controls monarchs and peoples. (My Italics)
8. A News article on France 24 about an April 6 bombing in Baghdad that killed twenty-eight people and injured seventy-five more.
9. Scutigera coleoptrata, aka The House Centipede, aka The Twenty Eight Legger. They are quite funky legs, the sort of fluffy type rather than the more solid, straight-up-and-down type. It actually looks a bit like the one that stung me in Queensland. I can''t quite see if twenty-eight is exactly how many legs it does have. It seems like an odd number to choose though doesn't it, wouldn't God just round up? I am hard put to see the French connection, but there are a lot of links on this page, an excessive number in fact—maybe one is for a lovely garlic soaked centipede recipe?
10. A promotion from Alis—highway construction company responsible for the A28 from Rouen to Alencon. They set up a couple of 'Take a Break' spots for motorists during the holidays this year where instead of a cup of Tetley with one of those teeth-curling wooden stirrers, you could get a shoulder massage. I am not sure if that would actually wake me up—I'd have to have a nap afterwards, hopefully not while I was driving. I have just read the full article one click later: they also had bouncy castles, magic shows, giant toboggans, a ball pool and giant wooden games. Man, that sounds like one ace highway!