When we eat packaged foods, it is true that we eat with our eyes and first impressions are very important. The way a product is packaged contributes to this experience, yet these unappetizing packaging designs don’t make these edibles seem any more appealing.

Subconsciously, we are drawn to fresh, vibrant colors found in fruits and vegetables and avoid off-putting colors like blues, greens and browns that remind us of mold and spoiled food.

Although some of these gross-out gag foods do not have the same charm as opening up a package of Harry Potter’s Bertie Bott Jellybeans—even if they are grass or earwax-flavored—these make great Halloween treats. Regardless of the time of year, these are an effective way to deter coworkers and other schoolkids from stealing your lunch.