Its that Coffee Mug..... Had one like that. Ex-Wife Used to drink cocoa out of it. The damn outer surface is textured and when she was not paying attention, she would run a tooth over it and scrape and GEEEEEEEEEEEZ the face she would give was fkn stupid bad.... I bet she did that and threw the cup through the windshield and has been too embarrassed to post ever since.
Moral of this post? Don't Scrape Your Damn Teeth Ladies!!!!!!