mad as a

(as) mad as a hatter

1. Crazy or deranged; particularly eccentric. My grandfather came back from the war as mad as a hatter because of all the horrible things he saw. I'll be mad as a hatter if I have to deal with these screaming toddlers for much longer. My family thinks I'm as mad as a hatter just because I practice a form of alternative medicine using magnetic fields.2. Particularly cross or angry. Mom was mad as a hatter after I dented her brand-new car. John gets as mad as a hatter when he starts losing.See also: hatter, mad

(as) mad as a March hare

1. Crazy or deranged; particularly eccentric. My grandfather came back from the war as mad as a March hare because of all the horrible things he saw. I'll be mad as a March hare if I have to deal with these screaming toddlers for much longer. My family thinks I'm as mad as a March hare just because I practice a form of alternative medicine using magnetic fields.2. Particularly cross or angry. Mom was mad as a March hare after I dented her brand-new car. John gets as mad as a March hare when he starts losing.See also: hare, mad, march

mad as a

hatter/March hare Crazy; mentally deranged.See also: mad