What should I do if someone around me is having a stroke?  

911. If you think there is a medical emergency- call 911 asap. Time is of the essence!
Call 911 first-fast! If person is conscious and can swallow, give 325 mg of aspirin. Keep person from falling or injuring self. Ensure no airway blockage occurs and stay calm until ambulance arrives. Tell paramedics exactly what you saw and heard, without speculating or embellishment of the event.