When to eject?

[wobster]

Since there seemed to be some disagreement with my article on game control, (I only read the first post, and didn't get to check it again before it was shut down) when do you guys eject a coach? Swearing, name calling, questioning judgment, walking onto field? I have never had to eject a coach, but I have not been jumped on too hard by any coach.

Where do you draw the line?

BTW: This is not meant as an insult, or anything to start a flame war, I am curious where other umpires draw the line.