Once upon a time a Cat and a Monkey lived as pets in the same house. He was feeling very vigorous indeed, and pranced around loftily, holding his head high. It pained the Dog a good deal, as you can guess. So the Ass lifted up his foot and the Wolf began to search very closely and carefully for the thorn. That one had not been able to run fast enough because of the weight of his brush. Now the farmer came in. When you are up there it is the roof that's talking, not you.
The evil doer often comes to harm through his own deceit.