The language barrier is strongest in the grocery store, where you aren't ever sure what you are buying. A number of people have reported purchasing what they thought was milk, only to find a thick yogurt drink pouring from their cartons and resting on top of their cereal.
In my case, I was looking for deli meat, which is always a useful food item to have on reserve. I settled on a reasonably priced, reasonable looking meat called Hamburgerkött, which resembled some sort of ham, based on the name and the color:
After using it in salad, pasta, sandwiches, omelettes, etc., I am informed by my Swedish friend Daniel who reads the packaging, that it is, in fact, Horse Meat that I have been consuming this whole time.
My guilt and disgust at what I have done is easily allayed by how good My Little Pony tastes.