Prince Rupert's Drop is a tempered glass object shaped like a tadpole with a very long tail. The funny thing about the drop end of the glass is that you can hit it repeatedly with a hammer and it just won't break.
However, if the tail end is very slightly grazed, the whole thing explodes, from tail to drop. Watch it all happen in slow-motion at 130,000 frames per second in the video below.
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