OKAY, OKAY, I know, Get something sharp, or a Airsoft gun that DOESNT have any soft balls in it, Use metal BB's, Go to wherever you think your friend was, Now, pull out your phone, Dial 911, Ask for an ambulance to go to the place your at, put the airsoft/BB Gun to your head, Pull the happy trigger, You will get your friends attention and he comes running to the sirens! Congratulations, You found your friend!
EDIT: If you dont have a airsoft gun or BB Gun, use a knife or something sharp.