While making a minor correction to some code, you notice a massive flaw in some adjacent code. Do you:
A: Check the blame log to see if you did it, and if not, forget you ever saw it.
B: Having no time allocated to fix it, tell the tester on the sly how to trigger it, so that in six months time when testing comes around it'll get officially found and someone will then be given the hours to fix it.
C: Make a note of it to use as ammunition in the next finger-pointing blame game.
D: Not wanting to have to deal with the egotistical incompetent who wrote it and will take correcting it as a Machiavellian power play, leave it there but write a working version of the same, and change every use of it to your new version.
I have done all of these :(