Consider this water bottle: 
When it is full and thrown up in the air, it rotates at a constant velocity.
When it is less than 1/8th full, the water bottle rotates even faster than when it was full.
When it is half full, however, the water bottle rotates for one half-spin, and then it stops rotating.
Why is this?
By the way, I tested it with a 16.9oz bottle, but the bottles are mathematically similar.
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