In reply to bouldery bits:
On our first trip to Yosemite we camped at Crane Flat, which has a more backwoods vibe than the sites down in the Valley, and bear action was more likely. We all got very excited the first time one wandered into camp, and rushed to get our cookware to bang while shouting "Go Bear!" as we'd been instructed. The bear looked idly round, scratched his ear, yawned and thereafter ignored us while he went about his business. We decided cameras made more sense than saucepans and quickly changed implements. Eventually a ranger turned up, stood behind the car door so her uniform didn't frighten him off and - pretty much as star-struck as the rest of us - sighed, "He's just like a big squirrel really."