From the book Japanese Tales:
A wife and her lover were once in bed when the husband came home. Since the lover had no time to run or hide, the woman rolled him up in a straw mat, marched out with the mat under her arm, and announced that she was going to knock the fleas out of it. As she jumped over the hearth, the naked lover slid out and fell thump into the ashes. The husband’s eyes widened. “Biggest flea I ever saw!” he exclaimed. He seemed to register nothing else.
The big flea fled on all fours.