One of my personal favorites is on boats with outboard motors: " don't use the motor as a step to get in the boat while the motor is running"-- or something to that effect.
The one about not having pet birds in the kitchen is Not Dumb! I would go so far as too say it's too mild of a warning. It should say " Do not use in a building containing pet birds" There have been many many birds killed by self cleaning ovens and someone leaving a dry teflon coated pan on the stove.
I have a rule in my home. No Teflon Allowed!.