Yes, I know it is something which most of us do occasionally; and more often for some of us.
I was walking along one of the old cross country paths which once linked farms and hamlets together when I discovered a pheasant on a stile.
Carefully moving around and closer (but without any cover) I got close enough for some shots with the 24-105 lens which was on the camera and large enough for the overall scene.
Av setting at F8 was producing shutter speeds around 1/500 to 1/800 at ISO 400 which was plenty fast enough to cope with any slight movement from the bird.
Suddenly, the bird flapped it's wings and rose vertically. When it was beside the Public Footpath sign with wings outstretched and facing towards me, I clicked the shutter.
And of course, by then Evaluative Metering auto selected 1/200 which was far too slow; so the bird was hopelessly blurred.
I should have reset to Tv once I had taken the first shot because it was inevitable that sooner or later the bird would take decisive action.
Here is the previous shot.
'I said the path was for peasants not pheasants'!