We went for dinner with a Korean friend and his girlfriend a few nights back. He was trying to tell someone what a dish made of. The dish was made with Goguma, but he could not think of the English word. After thinking for a bit he opens his mouth to have these words come out "It is potato friend."
I was listening to him and knew he was trying to say sweet potato, but wanted to leave him to figure it out on his own. Eventually it came out what he meant, and then someone else told us about how her students do this "friend" thing as well. Apparently, a table friend is, in fact, a chair. I am guessing that a spoon friend would be chopsticks, a pen friend a pencil, and so on.