Speaking of the 10 Commandments, people often think "taking the Lord's name in vain" means using curse words. But, ironically, what it really means is doing shit like this.
Spot on, I grew up in a very religious household where things were very rigidly interpreted. To them, "taking the Lord's name in vain" meant specifically saying "God damn it!" It didn't occur to them that the *actual* meaning was using God as a tool for leverage, fear, etc.