Here is a list of warning labels found on products. A more complete list can be found at the link at the bottom of this post.
"Caution: The contents of this bottle should not be fed to fish." -- On a bottle of shampoo for dogs.
"Do not use while sleeping." -- On a hair dryer.
"Shin pads cannot protect any part of the body they do not cover." -- On a pair of shin guards made for bicyclists.
"Do not drive with sunshield in place." -- On a cardboard sunshield that keeps the sun off the dashboard.
"Not intended for highway use." -- On a 13-inch wheel on a wheelbarrow.
"May irritate eyes." -- On a can of self-defense pepper spray.
"Warning: May contain small parts." -- On a frisbee.
"Please keep out of children." -- On a butcher knife.
"Do not look into laser with remaining eye." -- On a laser pointer.
"For use on animals only." -- On an electric cattle prod.
"For use by trained personnel only." -- On a can of air freshener.
"Remember, objects in the mirror are actually behind you." -- On a motorcycle helmet-mounted rear-view mirror.
"Please store in the cold section of the refrigerator." -- On a bag of fresh grapes in Australia.
"Twist top off with hands. Throw top away. Do not put top in mouth." -- On the label of a bottled drink.
"Do not iron clothes on body." -- On packaging for a Rowenta iron.
"Wearing of this garment does not enable you to fly." -- On a child sized Superman costume
"Do not attempt to stop the blade with your hand." -- In the manual for a Swedish chainsaw.
"Do not use orally after using rectally." -- In the instructions for an electric thermometer.