I burned my tongue a few years ago and made a marker that tells you when your tea or coffee cools.
Thought this would be a cool, innovative little value add for the hot drink segment. So far feedback from shops say it is neat but it's hard to implement behind the counter due to time; they recommended putting it on a counter with a sign explaining what it did for customers to apply themselves.
Here's a 1 min vid: http://youtu.be/qWORQbA8l-w
What do you think? I'd love to hear feedback and would provide a few samples to people.