[The reader of this dialogue needs to know three things: (a) due to the force with which I blow my nose, I use paper towels instead of Kleenex; (b) I have a cold; (c) because of "a" & "b," yesterday I put a roll of paper towels next to my desk in my study.]
P: "Lisa, where's the paper towel's?"
L: "I put them away."
P: "But they were in my office."
L: "But they're my paper towels."