The REAL story is apparently that bread used to come unsliced. Slicing was difficult, since the humidity, timing, etc... had to be just right! If not, it could dry out, not be cleanly cut, etc... Also, packaging was difficult. Anyway, someone came up with a way to do it, quick, clean, automated, and apparently he had quite an ego. He would say that something was the best thing since sliced bread, and it caught on.
But WHAT is so special about getting college credits while you are in college? Isn't that a given, if you attend classes and get decent grades?