I'm going to go to the archery range and practice hitting civilians.
You're sick. Why would you want to practice hitting civilians at an archery range?
I think it would be funny to hit them with arrows.
Hitting people with arrows is dangerous, potentially deadly and certainly not funny. Injuring people for your amusement is wrong and immoral. You need to re-evaluate your behavior.
I guess, but I saw it on YouTube, so it must be cool...
Just because something is on YouTube does not make it cool, and the people you saw probably were trained or did some trickery to make it look cool. You are going to hurt someone seriously, and get yourself into a lot of trouble. You should know how dangerous arrows are and have the sense not to copy a stunt like this.