He then does something that probably means he's certifiably crazy.

"They thought we were certifiably crazy," she said.

It's certifiably crazy.

Sanderson, however, concludes that Yossarian is certifiably crazy.

Dr. Karadzic, a psychiatrist by profession, said last week that General Mladic was certifiably crazy, an official who was present said.

If Wölfli was certifiably crazy - diagnosed with delusional schizophrenia - it is hard not to think that he was also crazy like a fox.

Kirk is certifiably crazy, Picard thought as the first bumps of hypersonic buffeting began to vibrate through him.

A marriage-of-convenience in which he slept on the third floor while Virginia slept on the second floor was going to make him certifiably crazy.

That he was talking to a ghost no longer mattered to him, and somewhere in the back of his mind was the suspicion that he had gone certifiably crazy.

It is, in other words, a creature that quite a few people - not all of them certifiably crazy, some of them bearing impressive documentation - claim to have seen.