Nokia Uses Heat Sensitive Adverts to Promote Phones:

Nokia has been running adverts on heat-sensitive billboards to promote the fact that its touchscreen phones work while people are wearing gloves.

The thermo reactive billboard displayed messages which changed depending on the surrounding air temperature, from 'MAKE LOVE' and 'SEND LOVE', to 'MAKECALLS WITH GLOVES ON' and 'SEND TEXTS WITH GLOVES ON' when the temperature dropped.