Found a big piece of plastic in one slice of bread

This morning I bought half brown bread at a shop nearer to where I stay and i normally buy Blue Ribbon bread there every morning and never experienced any problems with the bread. Well to my surprise this afternoon at work when I was about to butter the bread I noticed that the fourth slice had a blue plastic sticking out a bit....a big and obtrusive piece of blue plastic! It seems like the plastic fell into the dough or something and was baked with the bread, the way it is so attached to the bread.