Never buy sheet sets for your child's bed. Never. Simply purchase a plush mattress pad, a plastic bed liner and make sure your child has a bed-bug-less pillow with a half decent pillowcase. You're then good to go. IF there should ever be an "accident" on the bed during the night while your child is sleeping, the amount of laundry you have to do will be minimal. And you won't have to dread changing sheets on the top bunk anymore.
Never buy shoes for your child. They'll just lose them and insist on going barefoot anyway.
Never discourage your child from talking to strangers. That way when they see their own grandfather for the first time in 6 months, they won't be afraid to sit on his lap.
Never treat the stains on clothing with stain remover. Before you have a chance to wash laundry, that clothing item will grow mold. Unless you wash laundry more often than every 2 weeks.
Never change your vacuum-cleaner-bag in front of your child. The child will think he has free access to the vacuum-cleaner-bag whenever he wants. If the said vacuum ever malfunctions, check the said bag for complete connection. The said child may have disconnected the said bag.
Never use a glass jar of any kind for your daughter to put her fireflies in. You will lose all rights to your canning jars during your child's entire childhood because each jar will be used (and broken) all for the sake of insects.
Never plant seeds in your garden in front of your child. They may be tempted to go back to the garden later and try to find all your seeds that you buried.
Never buy sidewalk chalk and expect your kids to use the side-walk chalk ON the sidewalk. Instead, they will use it in buckets of water to make paste, as bullets in their "guns" and will throw it up in the air just to see it shatter in a million pieces when it hits the cement sidewalk.
Never teach your kids how to ride bike. They will expect you to take them on a bike ride every evening before supper for the rest of their child hood.
Never tell your child they must stay in bed until 4pm for their nap. They will lay awake staring at the clock until 4pm.
Never allow your child to play with straws in the bathtub. That way, in the event they should poop in the tub.... well, it's just better if they don't have straws.
Never allow your child to play a game on your cell phone. They will remove any phone protectant cover you have on the phone.
Never allow your child to play a game on your cell phone. They will delete your entire chat history with all your IM friends.
Never allow your child to play a game on your cell phone. They will call the police with the phone instead.