I'm willing to sacrifice the former and my wife is willing to sacrifice the latter so I guess we must be bad parents too. We both try to use the parental quotes we grew up with. We use the "grown-up zone" a few minutes after I get home from work but we have never used the"'Don't bother me unless you're bleeding'. My personal favorites are "If I have to stop this car..." and "I don't care which one started it, if I punish the both of you I am sure to get the guilty party".
Two years ago when my daughter was five, my wife said "When you move out to go to college..." and my daughter burst into tears. After we consoled her we had a good laugh about it.
His laugh breaks the tension, teaches him to keep things in perspective, and teaches him to wait.
My 11 year old says to me, "Mom, please stop bugging me!". I tell him, "hun, it's my job. If I didn't bug you, then maybe you wouldn't move out of this house after college!" I then use his uncle as an example, and he can see my point. :)