I'm guessing there were chips in the bag, though? Even with the unexpected free gift, the contents still matched the description. Now, if the bag only contained a roach and nothing else...
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'