mad as a hatter — mentally disturbed; deranged; insane; demented.
crazy — If you describe someone or something as crazy, you think they are very foolish or strange.
adjective round the bend
ape — Apes are chimpanzees, gorillas, and other animals in the same family.
flipped — to toss or put in motion with a sudden impulse, as with a snap of a finger and thumb, especially so as to cause to turn over in the air: to flip a coin.