D'Anna: Boomer's an Eight. Shouldn't she be on the other side?
Cavil: Boomer's my pet Eight. She's seen the light of reason. And an Eight can make a passionate ally.
D'Anna: Oh, until she sees something shiny...

"Not much changes around here... except for the occasional allegiance."

Rattrap to Dinobot, Transformers Beast Wars

You want me to take a Sith whose trustworthiness seems to depend on the time of day, the season, and the phases of whatever moons happen to be nearby, on a potentially dangerous mission to the Sith homeworld?

Luke Skywalker, speaking of Vestara Khai, Fate of the Jedi: Ascension

"I, Baron Von Beaver, once bad, then good, then bad again, and now something that's neither."

Norbert as Baron Von Beaver, The Angry Beavers

Douglas: I just met a guy named Vincent.
Heather: Vincent?
Douglas: He's a friend of yours, right?
Heather: I'm not sure.

Look, I've dabbled in being a bitch. It's part of the reason I moved here. I was really hoping to just... leave it all behind me.

—Ramona, from Scott Pilgrim