system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does saliva sometimes shoot from a person's mouth when they're yawning?
gpt
Otherwise called "gleeping", or "gleeking": what happens when you yawn, your tongue squeezes back and compresses the tissue beneath it. Under your tongue there are little tube-like glands that produce saliva (salivary glands). These are normally filled with saliva, and once compressed by your tongue, they expel the saliva inside them. Since the glands are like little tuves, it squirts the saliva out like a gun.