fly off at a tangent

fly off the handle

To become very angry or enraged; to throw a fit or go crazy.

fly in the ointment

Something (especially a minor thing) which ruins or spoils everything …

fly on the wall

A quiet, non-participating, or unseen observer; an eavesdropper or wit…

fly in the face of

To act in a manner highly contrary to; to counteract or contradict.

fly by the seat of one's pants

To pilot an aircraft without the aid of instruments and without a flig…

fly low

To have one's fly (zipper) undone.