How many people know that the comma operator is overloadable?

gistfile1.txt

#include <iostream>

template<typename T>
std::ostream& operator,(std::ostream& s, const T& x)
{
  return s << ", " << x;
}

int main(int argc, char* argv[])
{
	std::cout << "A", "bunch", "of", "comma-separated", "strings";
	return 0;
}