If you tap for a really long time on someone's forehead, they will slowly go insane. I've seen it happen
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There are 2 syllables. Fore-head.
To be a sign for later people not to kill him. By the way, "forehead" isn't in the text.
Tapping: you bouncing your pencil point or your finger on a desk. Taping: you using tape to wrap a present.
your temples
A TRICORN. That this 'three corners'. These type of hats were often worn by historical characters. There is also a 'BICORN' hat. Again often worn by historical characters. The points/corners of the hat being over the forehead and over the back of the neck.