Carly saw a billboard for a local church that said,"CH_ _ CH-What's missing?" This is an example of which technique for creating original and unexpected ideas?

Name: Carly saw a billboard for a local church that said,"CH_ _ CH-What's missing?" This is an example of which technique for creating original and unexpected ideas?
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Question

Quizplus · Accepted Answer

This is an example of a play on words as the missing letters are meant to make the reader mentally fill in the blanks to complete the word "church."

Carly Saw a Billboard for a Local Church That Said,"CH_