いしにくちすすぎながれにまくらす

Stubborn as a mule

Sun Ch'u planned to live the life of a hermit, where he would gargle漱 using water flowing流 in streams and use rocks石 as his pillow枕. However, when he told his friend, said 'I'm going to gargle rocks and lay my head upon the river.' When his friend pointed out the error, Sun Ch'u refused to admit the mistake, pretending he meant to say he would lay his head to the river to wash his ears and gargle rocks to polish his teeth.