Literal-Minded
A literal-minded person just doesn't get figurative speech, instead interpreting instructions, idioms, understatement, sarcasm, and so forth completely literally.
Some of the ways this trope is played:
Bothering by the Book and Exact Words, where somebody deliberately uses a literal interpretation in order to gain an advantage, make a point or "win" an argument, perhaps using Obfuscating Stupidity. Often used in Loophole Abuse. Compare Metaphorically True for similar manipulation tactics.
Literal Genie, and its malicious counterpart, Jackass Genie.
Mathematician's Answer
A reactive form of Spock Speak, to emphasize a character's alien...read more