The phrase "inflict a shock" refers to the act of surprising or startling someone. There are several other words that can be used interchangeably with this phrase. For example, you can say you "jolted" or "startled" someone with unexpected news or actions. Alternately, you might have "astonished" or "amazed" someone with a surprise. Other synonyms include "stunned," "shocked," "bewildered," or "flabbergasted." Ultimately, the choice of word will depend on the context of the situation, the level of surprise involved, and the intended tone of the communication. Regardless of the synonym used, the goal is always to catch someone off guard, creating a moment of sudden and unexpected surprise.