There was spend so much bitcoin in that pizza, I think deal with that story behind it may cause tradition huge rise in one particular day instead of sales lol.
Btw really nice idea, I like it very much. Did anyone have that idea before? I haven't heard.
Also it's a good idea if each store will do a surprise to one random man ans give everything in very big discount. Or as a symbol, if some buyers will get pizza with bitcoin's logo on it.