So, when I read about Nohot Cup, I was mystified. Finally, an answer to hot liquids!
While it looks like a regular coffee cup, its lid is made from heat sensitive materials, so when the drink is too hot, there will be a lump on the lid that will hit your nose if you try to drink it. Once the drink has sufficiently cooled down, the lump will slowly disappear, allowing you to drink your warm beverage without any risk of tongue burns.
More info here.
