Every company has a few trade secrets that are closely guarded by their employees. But at some point, workers get the urge to leak info, particularly if people will benefit from it.

Workers took to Reddit to share a few insider secrets, and some of them are genuinely horrifying, while others are quite useful, especially if you want a discount.

Here are the insider secrets that companies don’t want you to find out.

Pizza Hut

A Pizza Hut employee said that free extra cheese is usually added to a plain cheese pizza. Redditor spacezoro also said that if you want a discount, tell them that you’re an employee and use the $10 coupon code, which is said to be 2155.

For a special treat, ask the staff to make you a pizzone. Fold a pizza and place half of the toppings in it before crimping it shut. Top with the parmesan parsley mix before putting it in the oven.

Goodwill

A Goodwill worker said that most of the clothes that are donated are not washed. Another employee said that they throw away “a good 90 percent” of what they get.

Waterpark

A former waterpark employee said that nine times out of 10 when the pool is shut down for “maintenance” or low chlorine levels, it means that someone defecated in the pool.

Best Buy

A former employee said that if you’re buying a TV, make sure that the staff opens the box and checks the screen first before you take it out of the store. Apparently, a lot of the company’s products are dropped during shipping and packing, especially during Christmas, Boxing Day, and Black Friday.

Car dealership

Redditor TecN9ne said that you shouldn’t buy a car the first time that you visit a lot. Negotiate the price of the new car before you tell them you have a trade in. Also, if you’re buying a used car, always ask how long it has been on the lot.

If the car has just been dropped off, it means that it has a huge markup. It’s best to wait a few weeks, as that’s when the dealership boss would drop the price by about $1000.

For more, check out Jobs & Hire’s report on the jobs that are likely to be taken over by robots.