Someone who opens your room door, pokes his head in, and claims to be looking for someone you've never heard of might actually be hoping to find an unlocked room with no one inside. That's how most items in residence hall rooms get stolen, and it only takes a few seconds. If you see someone walking through the parking lot looking in cars or trying car door handles to see if vehicles are unlocked, report it. You might prevent a car from being broken into. They might not know if you don't call them.
Fires can and do occur in campus buildings.
If a fire has started consider your safety and others first before trying to fight a fire. Learn the best way to exit your building in case of fire and consider alternate routes in case fire has your main exit blocked. Most people die in fires because of smoke inhalation rather than of burns. Smoke from fires can be extremely dark and blinding. If your guests happen to be at the wrong place at the wrong time there can be problems.