3Dcheeseburgers.sourceforge.net?
Also, if you have an Easy-Bake oven modified to use a serial port and you wrote a driver for it, you might be able to make an actual cheeseburger with C++...
Seriously, though, you can do anything electronically possible with C++; the real issue is how well you can do it and how insane you'd have to be to complete it.
For example, a self-modifying executable written in C++ would theoretically be possible, but I wouldn't want to write it (although I wouldn't want to write it in any language).
You also couldn't write a universally-viewable applet with C++ for the simple reason that no browser (that I know of) supports any kind of C++ applets (although you could write a C++ compiler that compiles to JVM code...)
Even mundane tasks, such as string processing or GUI programming, can be done in C++, but it's often better to use a language more specifically designed for that task than to wade through doing it in C++.
Just because you have a hammer on your Swiss Army-Knife doesn't mean you should use it instead of a real hammer.