Catch-22 refers to a paradox in which a problem is created by the solution to the problem. The expression is taken from the eponymous novel by Joseph Heller. In it, a rule, Catch-22, is invoked to force characters in the novel to suffer varying forms of institutional abuse.
In the novel, the concept is introduced with the following exchange:<ref>Heller, Joseph (1961) Catch-22 ISBN 0671128051</ref>
Yossarian looked at him soberly and tried another approach. 'Is Orr crazy?'
'He sure is,' Doc Daneeka said.There was only one catch and that was Catch-22, which specified that a concern for one's own safety in the face of dangers that were real and immediate was the process of a rational mind. Orr was crazy and could be grounded. All he had to do was ask; and as soon as he did, he would no longer be crazy and would have to fly more missions. Orr would be crazy to fly more missions and sane if he didn't, but if he was sane he had to fly them. If he flew them he was crazy and didn't have to; but if he didn't want to he was sane and had to.
'Can you ground him?'
'I sure can. But first he has to ask me to. That's part of the rule.'
'Then why doesn't he ask you to?'
'Because he's crazy,' Doc Daneeka said. 'He has to be crazy to keep flying combat missions after all the close calls he's had. Sure, I can ground Orr. But first he has to ask me to.'
'That's all he has to do to be grounded?'
'That's all. Let him ask me.'
'And then you can ground him?' Yossarian asked.
'No. Then I can't ground him.'
'You mean there's a catch?'
'Sure there's a catch,' Doc Daneeka replied. 'Catch-22. Anyone who wants to get out of combat duty isn't really crazy.'