So you're merrily skipping through the forest, happy as a clam. Can clams skip? I bet they would, since they are a measuring stick for happiness.

Anyway, you're merrily skipping along through the forest. Unbeknownst to you, someone slipped a collar onto you. Now normally you wouldn't mind this. Collars can be fashionable afterall. I bet clams would enjoy a good collar.

Anyway, you're merrily skipping along through the forest having been adorned with a collar without your knowledge. BUT someone also attached a tether to the collar. A leash. A rope. A fixed length of.. something, presumably held or attached to a fixed point that isn't the collar.

There is some law of physics, maybe the clams know what it is, that when you reach the end of a tether, you can't go any further. If you are moving at speed, say that you are merrily skipping along a forest, and you reach the end of this unexpected tether while skipping along...

You are no longer a clam.

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Toru is mine.