We have three breakrooms at work, each with their own employee fridge. Two of the breakrooms also have a drink fridge with waters/soda/juice and for a while, milk cartons (individual size)

Somebody one day decided it would be easier to put their lunch bag in the drink fridge upstairs (which had all the milks at the moment) instead of the employee fridge (which had space, but would need to be reorganized a tiny bit). It made all of those milks taste like pickled jalepenos and garlic. Sooooo nasty when i took a bit of my cheerios..... makes me gag just thinking about it sometimes. Those paper cartons are terrible at isolating flavors