1)Teenaged boys (some girls too) are bottomless pits when it comes to pizza. If you need to rationalize, you can tell yourself at least there are some major food groups represented. And rewarding or witholding pizza can be a powerful behavior modifier.

2) When he stares into the fridge, he obviously is hoping that PIZZA magically appeared during the three minute interim. Or he's using the refrigeration as a concentrated form of air conditioning, especially after a particularly grueling game of basketball or soccer.

3) A grunt is universal 'guy' language and has to be interpreted in the context in which it was emitted. So the answer to this question is: all of the above, depending on the situation.

4) Excessive MTV consumption can usually be counteracted by an offer of (you guessed it) PIZZA.

5) When one or more are gathered in a room, you should do a),b) and c) as well as be thankful that for now they're not wreaking havoc on unsuspecting and innocent citizens in the world at large.

More intimately than most mothers, you have a savory opportunity to understand the male perspective at a developmental stage. With your guidance, watching him mature into a man will be a fascinating - sometimes frustrating - and insightful experience.

To undertake such a daunting task signifies you have everything you need to do the job, and in the event none of the insights offered in this post prove helpful, your love and understanding (and humor) will substitute quite nicely.

All the best.