There was a sturdy ram with a pair of thick horns on its head. It strutted about proudly until it came upon a bamboo and wood fence blocking its path. Casting a sidelong glance, the ram lowered its head and lunged at the fence, hoping to knock it down. The fence remained intact, but the ram injured its own horns.
Had it not been injured, the ram would have obstinately persisted in butting against the fence, perhaps even against the spokes of a wheel, until it bled with a fractured skull.
In the end, with its horns caught fast in the fence, the ram could neither advance nor retreat, and could only bleat helplessly.