English Idioms and Idiomatic Expressions 

Idioms: Madness and Insanity-2
from: 'not playing with a full deck'   to:  'take leave of one's senses'

• not playing with a full deck (of cards)
  • Someone who is not playing with a full deck (of cards) lacks intelligence or does not have full mental abilities.
    "Old Mrs.Whitehead was not playing with a full deck when she bought that fancy lawnmower!"
    
    
• go nuts
  • To say that a person has gone nuts means that they have become completely foolish, eccentric or mad.
    "I think the old lady has gone nuts! It's very hot today and she's wearing a fur coat!"
    
    
• (as) nutty as a fruitcake
  • Someone who is (as) nutty as a fruitcake is insane or crazy.
    "Don't pay attention to what the old man says; he's as nutty as a fruitcake!"
    
    
• (be) on another planet
  • Someone who is on another planet is oblivious to their surroundings or acts in a strange manner.
    "Charlie couldn’t do the assignment because he was on another planet during the teacher’s explanation."
    
    
• off your rocker!
  • If you tell someone that they are off their rocker, you think they are completely crazy.
    "You're going to give all your money away? You're off your rocker!"
    
    
• (have) rats in the attic
  • If you say that someone has rats in the attic, you mean that they are a bit mad or that their behaviour is eccentric.
    "She keeps repeating the same question. I think she's got rats in the attic."
    
    
• (have) a screw loose
  • If someone has a screw loose, their behaviour is strange and they appear slightly mad.
    "She wears a fur coat in the summer - she must have a screw loose!"
    
    
• stark raving mad
  • To say that someone is stark raving mad means that they are completely crazy.
    "You're stark raving mad to go sailing in this weather."
    
    
• stir crazy
  • If a person goes stir-crazy, they become very agitated or nervous because they have been confined to a place for too long.
    "After several days in quarantine, people were going stir-crazy."
    
    
• take leave of one's senses
  • To say to someone 'have you taken leave of your senses?' means that you think their behaviour is crazy.
    "You're going skiing in this blizzard? Have you taken leave of your senses?"