I bolded some of my favorites
"Do not use if you cannot see clearly to read the information in the information booklet." -- In the information booklet.
"Caution: The contents of this bottle should not be fed to fish." -- On a bottle of shampoo for dogs.
"For external use only!" -- On a curling iron.
"Warning: This product can burn eyes." -- On a curling iron.
"Do not use in shower." -- On a hair dryer.
"Do not use while sleeping." -- On a hair dryer.
"Do not use while sleeping or unconscious." -- On a hand-held massaging device.
"Do not place this product into any electronic equipment." -- On the case of a chocolate CD in a gift basket.
"Recycled flush water unsafe for drinking." -- On a toilet at a public sports facility in Ann Arbor, Michigan.
"Shin pads cannot protect any part of the body they do not cover." -- On a pair of shin guards made for bicyclists.
"This product not intended for use as a dental drill." -- On an electric rotary tool.
"Caution: Do not spray in eyes." -- On a container of underarm deodorant.
"Do not drive with sunshield in place." -- On a cardboard sunshield that keeps the sun off the dashboard.
"Caution: This is not a safety protective device." -- On a plastic toy helmet used as a container for popcorn.
"Do not use near fire, flame, or sparks." -- On an "Aim-n-Flame" fireplace lighter.
"Battery may explore or leak." -- On a battery. See a scanned image.
"Do not eat toner." -- On a toner cartridge for a laser printer.
"Not intended for highway use." -- On a 13-inch wheel on a wheelbarrow.
"This product is not to be used in bathrooms." -- On a Holmes bathroom heater.
"May irritate eyes." -- On a can of self-defense pepper spray.
"Eating rocks may lead to broken teeth." -- On a novelty rock garden set called "Popcorn Rock."
"Caution! Contents hot!" -- On a Domino's Pizza box.
"Caution: Hot beverages are hot!" -- On a coffee cup.
"Warning: May contain small parts." -- On a frisbee.
"Do not use orally." -- On a toilet bowl cleaning brush.
"Please keep out of children." -- On a butcher knife.
"Not suitable for children aged 36 months or less." -- On a birthday card for a 1 year old.
"Do not recharge, put in backwards, or use." -- On a battery.
"Warning: Do not use on eyes." -- In the manual for a heated seat cushion.
"Do not look into laser with remaining eye." -- On a laser pointer.
"Do not use for drying pets." -- In the manual for a microwave oven.
"For use on animals only." -- On an electric cattle prod.
"For use by trained personnel only." -- On a can of air freshener.
"Keep out of reach of children and teenagers." -- On a can of air freshener.
"Remember, objects in the mirror are actually behind you." -- On a motorcycle helmet-mounted rear-view mirror.
"Warning: Riders of personal watercraft may suffer injury due to the forceful injection of water into body cavities either by falling into the water or while mounting the craft." -- In the manual for a jetski.
"Warning: Do not climb inside this bag and zip it up. Doing so will cause injury and death." -- A label inside a protective bag (for fragile objects), which measures 15cm by 15cm by 12cm.
"Do not use as ear plugs." -- On a package of silly putty.
"Please store in the cold section of the refrigerator." -- On a bag of fresh grapes in Australia.
"Warning: knives are sharp!" -- On the packaging of a sharpening stone.
"Not for weight control." -- On a pack of Breath Savers.
"Twist top off with hands. Throw top away. Do not put top in mouth." -- On the label of a bottled drink.
"Theft of this container is a crime." -- On a milk crate.
"Do not use intimately." -- On a tube of deodorant.
"Warning: has been found to cause cancer in laboratory mice." -- On a box of rat poison.
"Fragile. Do not drop." -- Posted on a Boeing 757.
"Cannot be made non-poisonous." -- On the back of a can of de-icing windshield fluid.
"Caution: Remove infant before folding for storage." -- On a portable stroller.
"Excessive dust may be irritating to shin and eyes." -- On a tube of agarose powder, used to make gels.
"Look before driving." -- On the dash board of a mail truck.
"Do not iron clothes on body." -- On packaging for a Rowenta iron.
"Do not drive car or operate machinery." -- On Boot's children's cough medicine.
"For indoor or outdoor use only." -- On a string of Christmas lights.
"Wearing of this garment does not enable you to fly." -- On a child sized Superman costume.
"This door is alarmed from 7:00pm - 7:00am." -- On a hospital's outside access door.
"Beware! To touch these wires is instant death. Anyone found doing so will be prosecuted." -- On a sign at a railroad station.
"Warning: do not use if you have prostate problems." -- On a box of Midol PMS relief tablets.
"Product will be hot after heating." -- On a supermarket dessert box.
"Do not turn upside down." -- On the bottom of a supermarket dessert box.
"Do not light in face. Do not expose to flame." -- On a lighter.
"Choking hazard: This toy is a small ball." -- On the label for a cheap rubber ball toy.
"Not for human consumption." -- On a package of dice.