In the second season, Jack pokes her in the side while she tries to hide her drawing from his view. It's very quick, but she jumps adorably
In the fifth season, she and Pacey are messing around and he climbs on top of her and starts tickling her ribs off-camera, while she laughs and squeals adorably.
Also in the fifth season, she's talking to Audrey who starts tickling her knees off-camera. No laughter, but she does smile adorably and says, "If you tickle me one more time I will bit you."
Okay, I pretty much think everything she does is adorable. But still.