There are several synonyms that can be used interchangeably with the phrase "goes wacky." One of the most common is "goes crazy," which implies a sudden and drastic shift in behavior or mood. Another similar term is "loses it," which can refer to an outburst of anger or frustration. "Flips out" is a more intense variation on this, suggesting a complete breakdown or meltdown. "Goes bonkers" is a playful alternative that can be used in more lighthearted situations. Other synonyms include "goes off the deep end," "flies off the handle," and "goes batty." Regardless of the specific term used, all suggest a departure from social norms or expectations.