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Why the intelligence is also needed on a construction site

A worker who had to unload a wheelbarrow in a garbage container, had great difficulty in completing his mission.
Both his intelligence and his physique caused him great problems.

He climbed the wheelbarrow on an improvised ramp from a plank, and when the wheelbarrow reached the end of the plank, the plank began to rise, which caused him great trouble.

Watch it in action. Laughing or crying?