Take extra precautions. Lock up the bike. If you're on a big ride it's a long walk home, and losing your bike is certain to ruin the fun. Don't take too many chances or risks far from home. Dropping your bike around the corner from your house, and laying it down 100 miles from the nearest town, are two very different experiences.
Someone comes, someone helps.
Well, for Giorgio maybe. Correspondingly, if you've got a cell phone, bring it.