Let's be honest: planes are not the most sanitary places on Earth. Think about it: it's a confined space with people filled, for a number of hours, of all different levels of hygiene practices, medical issues and, to add insult to injury, it is not regularly cleaned. The formula practically writes itself.

Another aspect that not many people touch on is that passengers tend to get comfortable. A little too comfortable. A few hours into the flight, shoes start coming off, people start creating their own garbage nests around them and, if it gets REALLY bad, start using the plane as a public changing room!

And we empathize with you every step of the way! Here are ten things left behind on planes that make you ACTIVELY regret using the seat pocket.

10 The Aisle As Your Child's Garbage Disposal

We get it: sometimes you've got to bring your child with you when you're traveling. However, if you need to change their diapers, it's really not a good idea to leave them in the aisles or even in the seat pocket. Don't worry, there are garbages on the plane!

9 The Aisle As Garbage Disposal (Part II)

Airsickness is valid and sick bags are provided for a reason. However, if you need to use them, please don't hide them in the seat pocket or discreetly kick them down the aisle. It's not the kind of goodie bag that you want to leave for other passengers to find!

8 Don't Lose Your Head...Ummm...Teeth

There's no reason to be ashamed of your dentures. If you need them, you need them. However, the last thing an unsuspecting passenger need is to come across them in the seat pocket. We're also sure that food is going to be an issue at your destination...

7 Your Wig May Be Snatched, But Don't Forget It!

This is one of the lesser of these evils! If you're a performer or just someone who wears them for the aesthetic, you're going to have your wig on hand. However, leaving it behind will not only inconvenience you, but it'll also be a strange gift for the bystander who comes across it.

6 These Little Piggies...Hid In The Seat Pocket

This is one of the more traumatizing ones. As we mentioned, people take off their shoes when they get comfortable, especially on a 12-hour flight. However, if you hook your expensive designer heels into the seat pocket and leave them behind... as they say, one person's trash is another person's treasure!

5 Waste Baskets Are...Optional?

On long flights, by law, you're going to get fed. In-flight snacks, meals, and drinks are regularly handed out. But remember: this isn't your bedroom. Don't create a personal garbage pile in and around the seat pocket. The flight attendants will be MORE than happy to take your trash off your hands.

4 Your Little Angels Are Your Responsibility!

Children on flights are pretty common. But, unless you want to face child neglect charges, please don't forget them! Calming terrified children while desperately trying to find their parents will not improve the flight crew's mood. And we doubt you'll come across an impulsive flyer ready to sign adoption papers!

3 Clothing (And We Don't Just Mean T-Shirts)

No matter how comfortable (or uncomfortable you get), you shouldn't use the plane as a changing room. But people seem to ignore that rule quite often. Horror stories circulate of underwear and lingerie being hung on tray tables and even of socks being hung from the windows!

2 Not Your Kid's Toys!

During general flight craziness, your kid's toys might get left behind. It's a bit more problematic if it's one of YOUR toys... If you've brought them for stress relief, then you're up the creek. Also, it's guaranteed awkwardness for the poor flight crew that has to dispose of them.

1 Fluids (And We Don't Mean Your Drink Spilling)

It would literally break the Geneva convention to get on a 12-hour flight without a bathroom. It also makes for a challenge, you aspiring mile-high initiates! However, people find bags of various bodily fluids left behind. It's not hard to walk less than two meters to the bathroom!