Go off his rocker - Idioms by The Free Dictionary
go off (one's) rocker (redirected from go 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
My country and my people are friendly, peace-loving people but in a stadium, one fan can go off his rocker
and create an incident.
Even some of his Ministerial colleagues are privately concerned at Mr Blair's tendency to go off his rocker
at the slightest provocation.