The phrase "hits like ton bricks" is commonly used to describe something that has a powerful impact or effect on someone. If you're looking for synonyms for this phrase, there are plenty of options to choose from. Some possible alternatives include "slams like a sledgehammer," "pounds like a jackhammer," "smacks like a cannonball," "crushes like a wrecking ball," and "blows like a hurricane." Each of these phrases captures the intense and forceful nature of the original expression, and can be used in a variety of contexts to describe everything from physical blows to emotional experiences.