Someone who doesn't understand a very simple instruction is an example of a clodpole.
"clodpole." YourDictionary, n.d. Web. 22 June 2018. <http://www.yourdictionary.com/clodpole>.
clodpole. (n.d.). Retrieved June 22nd, 2018, from http://www.yourdictionary.com/clodpole
clod + pole (“head”)
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