One wrote: "The larger the menu at a restaurant the greater the chance your food was frozen and just reheated."
Meanwhile a takeaway chef said: "I work at a pizza place, the more toppings you order the fewer of each you actually get while still being charged the same price per topping."
Hoteliers were also quick to spill the beans, with one admission leaving redditors' skin crawling.
A hotel manager revealed: "Most of the time the comforter is only changed when visibly dirty.
"Always take off the comforter and use the blanket in the closet, or ask them to bring you one."
Former hotel maids chimed in to back up the claim, with one writing: "Previous housekeeper. Can confirm. It's disgusting."
"I worked in a 4 1/2 star hotel as a housekeeper for two years. Unless they were visibly dirty they only wash them once per month. Sometimes less during down season" revealed another.
A more surprising admission came from someone employed as a sign language interpreter.
One user said: "Sign Language Interpreting. A huge amount of them are under skilled and uncertified. When they don't understand a Deaf person, they will simply make up a translation and the deaf person never hears it.
"It leads to a lot of hearing people thinking a lot of Deaf people are morons, and a lot of Deaf people distrusting and being frustrated by hearing people patronising them."