Blocks dropped in Roadrunner cartoons (6)

I believe the answer is:

anvils

(Other definitions for anvils that I've seen before include "Heavy blocks for blacksmiths" , "Heavy blocks for the blacksmith" , "Iron blocks for blacksmiths" , "Iron blocks for hammering hot metal" , "Blocks for a blacksmith to work on" .)

I've seen this clue in the Universal.

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