Imagine that you're taking a five-year old to a state fair. He runs off into the crowd. You can't find him; he can't find you.
Well, Beckie of Infarrantly Creative has a fun idea that could help. Tag your child with a temporary tattoo featuring your cell phone number. She has a template, which you can find at the link. Apparently there's such a thing as temporary tattoo paper, and you can run it through a regular inkjet printer. That's the only thing you'll need to purchase to implement Beckie's plan.
Link -via Bit Rebels