Buffy: The Vampire Slayer - Slaves Bad
In the "Go Fish" episode Cordelia, Willow and Xander are talking about how unfair that the swim team gets more rights than the rest of the school. They then get onto the topic of Thomas Jefferson keeping slaves and Cordelia finishes her sentence with "Remember." The word doesn't fit in with what shape her mouth makes and because i can read lips she clearly says "I have one" (meaning she has a slave).
Episode "Go Fish"