True Story. I work at a bank and one day we received a call from one of our branches that was having problems with the keyboard at one of their drive-up stations.
I ask the teller what was wrong and she replied, "Our keyboard will not work, they keys are stuck!"
I asked several questions and it turns out that some water had gotten into the keyboard. It was raining and water had come through the air tunnels, where people sent their transactions in, and got into the keyboard.
It turns out that a branch person took the innitiative to fix the problem by using her hair blower to dry-off the water and in the process she melted several of her keys.