James(cosigner):HaHaHa man you to funny Leroy, you need your own show
Artez (to James):Man James you a co-signer man always laughing at Leroy lame jokes
The only acceptable response to a nod of acknowledgement is another nod. If you speak, you have broken the point of such a gesture.
(1) Walking past a friend to class
(2) Catching a friend's eye across the room to say "hi" without verbally saying it
(3) Giving approval of a friend's actions