Quote Originally Posted by strangebloke View Post
[*]Cast it on a friend? Why did you do that? That was really pointless!
There's an edge case where casting it on a friend makes a lot of sense. Let's say they're under some compulsion to attack you (confusion, crown of madness, whatever). Charm Person gives the target the Charmed condition which, on top of the advantage to social rolls, also says that the charmed creature can't attack the charmer. So, caster Charms his buddy, who is now unable to attack him, thus negating the spell or whatever that would have had the buddy otherwise trying to kill his friends. The Charm wears off in an hour, hopefully the other effect has as well, and the buddy is aware that you charmed him. "Hey, thanks," says the buddy. "That spell really saved our butts".

Circumstantial, but it's not nothin'.