Pulling the Tard Card
When everyone around knows that the "special" one is responsible for the event that recently occurred, yet someone still manages to defend said "special" person by stating how he/she is too innocent to do such a thing and/or how they have the mind of a child so how could they possibly think of such a thing to do. Also, doing this usually fails, or humiliates the defender.
Jury: *Unanimously* We all agree that (insert name here) is guilty for killing and mangling the woman and her two children.
Bystander: Wait a moment, am I not the only one who thinks he/she is innocent? How could such a sweet young man/woman do such a thing? Look, he/she has the mind of a 3-year-old. No 3-year-old has ever done this sort of thing!
Judge: Sir/Madam, sit down, or I will hold you in contempt! No 3-year-old has the body strength of a 450lb gorilla, either!
Man in Jury: He's/She's Pulling the Tard Card!
Bystander: Wait a moment, am I not the only one who thinks he/she is innocent? How could such a sweet young man/woman do such a thing? Look, he/she has the mind of a 3-year-old. No 3-year-old has ever done this sort of thing!
Judge: Sir/Madam, sit down, or I will hold you in contempt! No 3-year-old has the body strength of a 450lb gorilla, either!
Man in Jury: He's/She's Pulling the Tard Card!