Mariachi Hero
Before "Rock Band" and "Guitar Hero II" there was a little idea I cooked up* with a brilliant young art director for our stodgy liquor (tequila) client. Mariachi Hero!
Unfortunately, as is the case with most of my highly-amusing internet ideas, the client wanted no part of it.** Now it's available for sale at a reasonable price, plus development costs. How reasonable? Well, if you're cheap, just steal it and find your own programmers. What a bargain!
*In my own spare time, natch.
**The above version has been repurposed for el vaquero, which is (the way I understand it) some kind of college mexican restaurant chain. Personally, I only eat at nameless taco trucks, but they don't really "get" the internet.