[Xenmas]

When playing a half elven, incredibly childish mage I was traveling with a female thief that had decided (Behind a long story) to cut her hair and begin to dress like a man (a disguise). When my character saw her for the first time, the following occurred:

GM: "You see Mirror walking down the street"
Thief: "I try to get her attention"
GM: "How do you do this?"
Thief: "I wave my hands around and call to her"
GM: "Okay. Mirror, there is some guy screaming, flailing his arms, and running toward you."
Me: "I cast Charm Person"

Rolling dice, saving throw failed

Thief: "Mirror, it's me"
Me: "What happened to your hair?"
Thief: "I cut it. What was that spell you just cast?"
Me: "Oh. It was, uh, a protective spell. This city is dangerous. I decided to cast a spell on you so that nothing can hurt you."
Thief: "Why thank, Mirror"

Later in the game the thief is captured by the head of the assassins guild

Thief: "You can't hurt me. My best friend, Mirror, cast a protective spell on me"
Assassin: "O'Rlly. Show me."

Battle ensues. The funny part about it was that the PC kept rolling critical hits, and the GM kept rolling 1. After severely thrashing a character 5 levels higher than her, she was instructed that she could make no more saves against the Charm spell until she was injured in combat.