Many Americans are so addicted to their Blackberry devices that they've become "Crackberry" addicts. In fact, Clark knows that he could easily become one -- but he's taken preventative steps to ensure it doesn't happen.

Recently he was at the dentist when his smartphone began buzzing with incoming calls. So he actually took it out -- while the hygienist was hovering over him -- to see who called him. He'd be done in if he had a Blackberry that delivered e-mails on constant feed!

A new English study finds that 1 in 3 Blackberry users show addiction signs similar to alcoholism. While out at a restaurant, Clark noticed a couple both on their Blackberries during a candlelit dinner. That's definitely not a good way to earn brownie points with your date.

Some 14 million people now have Blackberries because they think it frees them up. But really it's more of a burden that makes you less productive, according to the study. You work more, but you're not necessarily more productive.

While Clark likes the convenience and portability of a Blackberry, he vows never to have a portable phone device that automatically feeds e-mails as they arrive. Christa, however, has wagered $1 that says Clark will have to eat his words in a few years. She expects all handheld devices to auto-deliver e-mails as a standard feature in the near future.

Clark has set his smartphone to deliver e-mail about 14 times a day. That way he doesn't get oversaturated. But Kim has already noticed that Clark is conditioned to look at his phone whenever it vibrates with an incoming call. Is he moving slowly but surely toward Crackberry addiction? Only time will tell…