Atmospheric Phenomenon

In the past month, Jeff and I have broken two of our favorite coffee cups. The first one that was broken was a big, red mug from Vegas. I loved that coffee mug - it was the perfect size and shape. The second one that broke was from Angelfire resort and our trip last Christmas. It was a good cup, too! Why can't we break the cheap white mugs that we have instead?? Now I guess we'll just have to make return trips to Vegas and Angelfire to replace the mugs...