Don't dip your pen in the company inkwell

The CEO of Boeing was just fired for some 'inappropriate behavior' with a female employee. Guess he didn't know the old maxim.... "you don't get your meat where you get your potatoes"-- or don't diddle the staff!

That's a good one. Along the lines of "Don't sh*t in your own nest." Do your diddling out of town (or outside the workplace).

You don't get your slash where you get your cash.

It's remarkable how many phrases relate to this behavior. "Don't dip your pen in the company inkwell."

Many more. "Don't screw the help or the help will screw you." "Don't stick your ---- in the cash register." Etc.