Answer: Your first day in a new school, or going to the doctor's for a checkup
Explanation: Scripts define a set of behaviors for a range of familiar situations and help us behave in a socially acceptable manner. For example, if it's your first day in a new school, you know that you need to be directed to your new class, and then asked to introduce yourself before you do so.
Also, in countries where seeing a doctor requires you to make an appointment except in emergencies, you know that you cannot just walk into the doctor's office without calling earlier and asking for a suitable date and time to meet with the doctor.