Heat-Sensitive ON/OFF Coffee Mug
This heat-sensitive coffee mug turns from "OFF" to "ON" when filled with hot liquid—preferably coffee, although ice-cold laudanum might also be appropriate.
It's 25 bucks right now at Charles & Marie, which is painful. Doubly so because my experience with heat-sensitive coffee mugs is that the plastic lining that actually does the changing can be too easily washed off, especially if left in a wet sink.
Soupe Du Jour [CharlesAndMarie.com via Technabob]

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Hmm, If it was also a self stirring mug for the price I'd probably spring for it.
'On' and 'Off'???
Why not 'Hot' and 'Not'?
or maybe 'Full' and 'Empty'?
or 'Chillin' and 'Smokin'?
howabout images instead, like 'igloo' and 'fireplace'?
I mean, seriously, just who WERE the design geniuses behind thse word choices?
Mark, wouldya be so kind as to smack them over their heads?
While interesting, I've given up on coffee mugs, they just don't hold enough liquid, I just stick to the large insulated metal travel types that hold 16oz plus.. less trips to fill it up!
For me I think cold it should say "DANGER" and when warm it should say "SAFE"
Kristofer, you could rig up a belt of several of those large insulated metal travel jugs and some rubber tubing and perhaps lab-style glass valves, and you wouldn't even have to get up from your chair for days at a time.
"Less trips to fil it up!" Indeed.