We've shown you various color changing faucets over the years, but many of them were either too expensive or too early of a prototype to be buyable. This updated LED Faucet light, however, is both real and cheap.
For just $19.99, you get a LED faucet light that streams blue water normally, but turns red as soon as it hits 89 degrees. Gimmicky, sure, but at that price how could you say no?
Product Page [Think Geek - Thanks tipster!]