Professor Simon is doing an experiment with Captain Feathersword about full, half full, and empty. Simon shows the Captain a full glass of cranberry juice. The captain tells Simon that he is thirsty and takes Simon's cup of cranberry juice and drinks half the cup. The captain puts the glass back on the table and tells Simon that he has his full glass of cranberry juice back. But Simon informs the Captain that its no longer a full glass of cranberry juice and it's now a half full glass of cranberry juice. Captain is still thirsty and drinks the rest of the juice. He gives Simon back the half full glass of juice. Simon tells Captain he drank it all and now it's empty. Captain apologizes and Simon tells him it's all right.