off one's trolley

The Romance is the best part of the four movements. One is a bit off one’s trolley at such times and I should surely write a better Suite at this time after twenty years of sober reflection.

1919, American Guild of Organists, edited by Thomas Scott Buhrman, American Organist, volume 2, page 409

On the whole, bodily symptoms have at least the consolatory fact about them, that they replace mental symptoms, fears of going off one’s trolley; and I suppose that, if I got rid of all the physical symptoms, things would but have been cleared away for a new worry about mental ones?

1915–1981, Kenneth Burke, Malcolm Cowley, edited by Paul Jay, The Selected Correspondence of Kenneth Burke and Malcolm Cowley, 1915–1981, Viking, published 1988, →ISBN, page 30

Being slightly off one’s trolley Uppermost in my list of top four teaching behaviours is being ever-so-slightly crazy ...^([sic]) to keep students guessing whether or not I have lost my marbles, and being not quite so predictable.

2006, Mike Ollerton, Getting the Buggers to Add Up, Continuum International Publishing Group, →ISBN, page 164