The civilian woman in the scene in Schisms where everyone's comparing their alien abduction experiences, but all she does is repeat whatever the last person said.
"The room was dark"
"Yes, dark."
"I was on a table, it was cold."
"Yes, cold."
"They jabbed me with a needle, it was very sharp."
"Yes, very sharp."
"You're not much help at all, you know."
"No, not much help at all, I know."