system
Given the following post, respond as if you're commenting on Reddit:
human
[Lilo & Stitch] Why is Stitch able to breathe in space but not underwater?
gpt
Stitch was illegally genetically engineered and though made nearly indestructible Dr. Jookiba deliberately made him to be vulnerable to water.  Likely as a way to terminate the experiment if things did not develop to his liking.