Non-humor-impaired Mother of a 10, a 13, and a 16 here. [chanting feverishly] (One more day, one more day, one more day…) ]
I’m going to go ahead and give real advice, just in case somebody really wants to know what to do.
What Dublos said, about free-for-all vs. carefully orchestrated present-opening.
Age 7 is definitely too young to comprehend the “one huge present equals X number of small presents” equation. The Dollar Store (a.k.a. Dollar Bill, Dollar Tree, All For One) is SUPERB for filling in the blanks at the last minute. A 7 doesn’t care whether the object under the paper cost about 20 cents to manufacture in China and will fall apart in less than 10 seconds. It’s a present, and it’s his, and that’s all that matters.
Don’t wrap clothes for the 7 at all, just hand them over in the Wal-Mart bag. Or warn him ahead of time, when he grabs the box and starts to rip paper–“oh, um, that’s just clothes”. He’ll like you better for it. To small children, wrapping clothes in Christmas paper is a kind of lie that certain grownups tell. Or if you must wrap the clothes, and don’t want to go the “tip-off” route, put them in very plain tissue paper, preferably in an “old lady” color, like lavender. That will give him a visual cue not to get too excited.
DON’T put pants in one box and shirt in another and think for a moment that it counts as two presents, 'cause it actually counts in the negative presents. “Oh, man, two in a row, with just clothes…” He’ll never trust you again.

