2x8 - Strange Days at Blake Holsey High

Marshall gets into the cell phone business, but when his business partner, Tyler, wants to use Marshall's special smiley code to cheat on a test, Marshall actually complies. Marshall feels guilty afterwards and Tyler warns him not to tell, but Marshall's new invention turns against him: he can no longer talk understandably. To make matters worse, Professor Z and Principal Durst know Marshall cheated on the test with Tyler...