This article highlights several 'bad' habits and studies that shed light on their positive aspects:
- Sleeping in late is associated with higher intelligence and earnings
- Being messy may support creativity
- Being late may be the result of obsessive thinking
- Swearing may be an indicator of healthy verbal abilities
- Watching trashy movies may indicate that you are a "well-educated cultural omnivore" that watches for ironic pleasure
- Procrastinating may be a sign of perfectionism
Like all behavioral studies, their value is not easily determined - hinging on their interpretation/context, and whether they are reproducible.