The simple answer to "When should a man obey his wife?" is the following: when she says, "Whatever you do, I don't care about the circumstances, never put a crayon in your pocket." Also he might pay added attention if she includes the phrase, "Never, never, never put a crayon in your pocket, ever, ever, ever."
But the Good Lord didn't intend that a man obey his wife. Which is why crayons end up in the man's pocket, and then into the laundry, and then into the dryer, which then, in varying degrees, bespeckle all the clothes, and completely turn the interior of the dryer a Crayola brown and "mountain green."
This has happened to me several times before, and I haven't been able to trace the culprit as easily as I can now. This doesn't matter because I can already hear, not only from the man, but from every corner of the blessed earth: "You should have checked the pockets."
Yes, I know, thank you very much.