When you open a zip bomb, your system starts decompressing the archive, which can rapidly consume all available system resources. This can lead to the system freezing, crashing, or becoming unresponsive due to the excessive CPU and memory usage. In severe cases, it can cause a denial-of-service condition, making your computer or network services unavailable. Additionally, if the zip bomb is designed to be particularly malicious, it might cause data corruption or loss during the decompression process.