At last the Mock Turtle recovered his voice , and , with tears running down his cheeks , he went on again : -- ` You may not have lived much under the sea -- ' -LRB- ' I have n't , ' said Alice -RRB- -- ` and perhaps you were never even introduced to a lobster -- ' -LRB- Alice began to say ' I once tasted -- ' but checked herself hastily , and said ` No , never ' -RRB- ' -- so you can have no idea what a delightful thing a Lobster Quadrille is ! '