The Evil eye.
The concept is that if you have something that someone might envy. You are in danger of having a curse of ill-will on you. Albanian's are very fearful of this and have many ways of warding off this curse. They might have something like these eye beads. They might put a stuffed animal, flag, garlic or a ram's horn up. This is supposed to lure the evil eye away because it draws it to those things instead. They are also careful about complimenting someone or appreciating somebody's things too much. You don't want to inadvertently put the evil eye on someone or be blamed for bad things happening in other people's lives.
In America I think it might correlate it to our expression, knock on wood. The feeling that somehow if we admit that we are doing well, or that we are really happy, or that we like something too much that somehow it's going to taken away from us. If it's too good to be true, it is.