9: Water bad!
You know how many times I see people just walking their dogs, in the rain, on the phone? Well, I live in Seattle, so I can assure you - I see it frequently. But it's a terrible idea! Just like you wouldn't want to drizzle water on your laptop keyboard, you shouldn't be handing your unprotected phone to your drooling, teething, adorable little baby. It takes very little for liquids to short out electronics, often causing permanent damage, especially when they're not water (milk, wine, soda, juice, etc.) and will leave a residue inside of your electronics.