The Dobler-Dahmer Theory is devised by Ted Mosby. In P.S. I Love You, Ted explains to his gang, that

"If both people are into each other, then a big romantic gesture works: Dobler, but if one person isn't into the other, the same gesture comes off serial-killer crazy: Dahmer."

This is further explained applying this theory on how Marshall asked Lily out by singing her a song he wrote at Wesleyan University. Ted, being charmed by Jeanette finding him, believes at first that she is a Dobler, but she turns out to be a Dahmer.


Notes and Trivia

  • The Theory is a reference to Lloyd Dobler from the late 1980's romantic comedy film, Say Anything, and Jeffrey Dahmer, an infamous serial killer. 
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