Went off his rocker - Idioms by The Free Dictionary
go off (one's) rocker (redirected from went off his rocker)
go off (one's) rocker
To become crazy or mentally unsound; to become extremely foolish or foolhardy. I'm going to go off my rocker if I have to hear that blasted song once more! I think Jane's grandmother has gone off her rocker lately. You must have gone off your rocker if you think that's a good idea!
References in periodicals archive
Then he went off his rocker
in the parade ring with the Prix de l'Arc de Triomphe being shown on the big screen, so you see, that's not his true running.
The star has revealed he almost went off his rocker
struggling to write material for the new CD Seal IV.
The boss went off his rocker
at us a bit at half-time, he knows how we can play and it is frustrating for him when we don't perform to our best.