It will fall over dead immediately, legs straight up in the air. A new, bigger head will grow in its place. It will run around for about a week, then die of thirst. Cockroaches don't have heads. It will grab its head and reattach it.
Male cockroaches have the babies.
Usually only once, and she'll stay that way the rest of her life. Only when the tide is in, and after she snacks on pickles. Eighteen times 3. The roach just shed its skeleton. You're seeing things.