Yoyo, yō'-yō, n, ancient Filipino hand-held weapon
"Isn't the Slayer supposed to be good at this stuff?"
"She is! Uhm, y-you are, aren't you, Buffy?"
Buffy grimly unwound the string from her finger for another try. The brightly coloured plastic whizzed through the air, arced around with deadly force and clouted Xander on the back of the head.
"Ow! That's - oh!" His protest was cut short as - to her own surprise, let alone his - Cordy started massaging away the pain. "Carry on."
"I won't let this beat me. Right, here goes..."
"...Oops. Uh, I'll go and buy everyone a new drink, shall I...?"