I’ve been into this one for years now. Sandwiches are the cleanest fast food there is, plus they don’t need to be expensive. The right fillings and the right bread and whammo, that’s a nice little meal. However, it’s hard to walk around eating one (or at least not a good one). So, here’s a way to eat a submarine sandwich with one hand and not make a mess.
Somehow, via some food-science wizardry, one makes this floored cylinder of bread that’s crusty on the outside and inside surfaces. Ergo, the various liquids inside (mayo, oil & vinegar, pesto, etc) don’t instantly soak into the bread and get it all soggy and gross.
With a flat-ish bottom one could set it down. Further, one could wrap the bottom half in wax paper and set it down in his car’s cup holder, which would probably make the thing wildly profitable. (Apocalyptically so, perhaps, since having people eat more and more meals while walking or driving isn’t exactly the recipe for utopian perfection, but hey, get it while you can.)
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(Friday May 1st 2009 addendum)
Behold what someone observed in Italy one day:
Pretty close! Conical instead of cylindrical, but still.
Longshot City 
September 2, 2008 at 7:49 pm
OMFG the cupholder part of the idea is awesome!
September 2, 2008 at 8:00 pm
You’re the inaugural commenter, Patri. That wins you a lifetime supply of these things if they’re ever mass-produced.