• Some people have it, some don't.
• Those who have it would be devastated if it were cut off. 
• It can be up or down.
  It's more fun when it's up, but it makes it hard to get any real work done. 
• Once you've started playing with it, it's hard to stop.
• Some people would just play with it all day if they didn't have work to do. 
• If you don't apply the appropriate protective measures, it can spread viruses. 
• It has no brain of its own.
  Instead, it uses yours. 
• We attach an importance to it that is far greater than its actual size and influence warrant.
• If you're not careful what you do with it, it can get you in big trouble.