I think it's only fair to split the tip between Tim Cook's iPad engineering staff and the restaurant waitstaff. Unless the iPad crashes or the server drops your food. Now if the server drops your food on the iPad, causing it to crash... that's a tough one since the iPad would ideally be engineered more robustly.

Of course, all this points to the future when the non-automated portion of restaurant service will be increasingly non-existent. What are the people who need to tip to feel better about earning much more than waiters while working less going to do then? Tip the robots?