Trick paint.

Bad ass. Remember those hyper color shirts that changed when they got hot? Maybe something to do with that.
Unfortunately, the only areas that changed on my shit was my armpits.
 
Yeah, that's cool.

Company I worked for back in the '80s had some promotional novelty coffee mugs. When you poured hot coffee into them, the company's logo and slogans would slowly appear on the side of the mug. Popular item...
 
we all(well, most of us} know long pipes don't equal holed pistons, its all in the carbs, but that's a different thread.
 
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