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.

Q: Ted Mosby:  Look , there 's a fine line between love and insanity . It 's the Dobler - Dahmer theory .
Lily Aldrin: Damn , I always forget the little _ one _ !
Ted Mosby: All right . If both people are into each other , a big romantic gesture works . Like Lloyd Dobler holding up the boom box outside Dianne Court 's window in Say Anything . But if one person is n't into the other , the same gesture comes off serial - killer crazy , or Dahmer .

A: theory
****
Q: Boyd Langton:  The one who wanted to be rolled in eggs and flour and dipped .
Adelle DeWitt: Ahh , Tempura Joe . Such a lonely soul .
Boyd Langton: Thought I 'd seen it all . But this engagement , * honestly * , this _ one _ 's sick !

A: engagement
****
Q: Amy Farrah Fowler:  You know , if being on your own is new to you , I 'd be happy to share some tension - relieving techniques for ladies that I 've perfected over the years . For example , do you have an electric toothbrush ?
Penny: Uh , no .
Amy Farrah Fowler: You should get _ one _ .

A:
toothbrush
****