self control. Many people dont have it. They are unpatiente and keep running. If you have the abbility to stay calm and wait it means you are not stressfull so your body and mind working well.
Maybe i am old fashioned or my parents done a well job when they teach me. Nowdays some people even dont let the old or the pregnant or a woman with a young child to go first in the line. Thank God i am not like them.😉