Many parents use timeouts to deal with undesirable behavior in children younger than 5. It goes like this: Child breaks rule. Parent puts child in an isolated location (the naughty chair) and ignores him for one minute per year of age, while the child considers his behavior.
When time's up on the timeout, parent and child discuss the problem behavior, hug and move on.
Sounds simple, right? Too bad experts say it doesn't really work.