Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Spike:  Come to serenade me ?
Buffy: So you know what 's going on .
Spike: Well , I 've seen some damn funny things in the last two days . A 600 pound Chirago demon making like Yma Sumac , that _ one _ will stay with you .

things