The universe has a law that goes like this: If you leave the house looking like you just rolled out of bed, you will see someone you know—most likely someone important, someone you haven't seen for a long time.
Sometimes you look like that, but you think you are safe inside your house. You are not tempting the universe in any way. And even then, the law of the universe will sometimes come to find you. For instance, if you decide to deep clean and thoroughly rearrange your apartment, buy and assemble a new couch, throw everything you own into upheaval, and place pieces of junky, disassembled furniture just outside your door, your landlord (who has been out of the country for a year) may just drop by. You should have at least done your hair today.