A purple cabbage
A bone
An artichoke
A grenade
A cigarette foil ball
A rattlesnake
An armchair
Pearls
A mechanical calculator
A concert hall
Kiwano melon
A nautilus shell
A Soviet submarine
A hard disk drive
A sea scallop
A lotus root
A piece of fossilized white oak
An aerial firework
An accordion
A cigar
A battery
An aloe leaf
A tube of toothpaste
A cacao pod
An agate shell. Minerals have grown in the voids of the shell and eventually replaced the shell itself.
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Even though I recognize it as an un-Christian reaction, I can't help enjoying your discomfort.