Check out these fun Mac-mods (why is it that Mac folks tend to mod, and others maybe not so much?) for Halloween!
Children's Halloween Safety Tips for Trick-or-Treating
Yankee Halloweens excellent list of Halloween Safety Tips
I'm not sure about this caution though... "DO NOT, repeat, DO NOT wear and use rollerblades to go out trick-or-treating" -- what if I'm planning to be "a rollerblader" this year?
Info on "upset stomach", or "indigestion"