It may be a one off but still worth mentioning, I was making a cup of tea in my Gimex Melamine mug yesterday, I put in the tea bag then added the boiling water, I went to get the milk out of the fridge when I heard a pop. I turned around to see that the mug had a large split from the top to the underside of the cup spilling boiling water all over my cooker....
We have now got two pot mugs from the pound shop...