“When we were little,” the Mock Turtle went on at last, more calmly, though still sobbing a little now and then, “we went to school in the sea. The master was an old Turtle — we used to call him Tortoise—”
“Why did you call him Tortoise, if he wasn’t one?” asked Alice.
“We called him Tortoise because he taught us,” said the Mock Turtle angrily. “Really you are very dull!”

― Lewis Carroll Tweet