Pulling a Scott

Pulling a "Scott" is when you use someone else's words as your own, without initially crediting them. Occurs in many contexts, including when someone makes a joke that's clever, somewhat obscure, and fits so well into the conversation it seems like they made it up on the spot. Also, when someone inputs something extremely romantic into a conversation, which is actually a song lyric or a movie line.

Lida: "Are you still gonna love me when I'm old and wrinkly?"

Scott: "I'll buy you Rogaine, when you start losing all your hair." (Ingrid Michaelson, The Way I Am)

Lida: "You're precisely the reason they call it 'pulling a Scott,' honey."