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Fill a Bag of Red
Everybody gets a paper grocery sack (you can decorate the sack too, which gobbles up half an hour). Set the timer for 10 minutes and instruct the kids to run around the house and fill their bags with red things. The one who gets the most red things wins. Some rules: (1) The things must fit in the bag. (2) By red, we mean red; this includes brown things with red stripes but not brown things with orange stripes. (3) No liquids in the bag. Period.