Because of a recent conversation, I decided to find out what a uvula is really for. For those who didn't know, that dangly thing in the back of your throat is called your uvula. It comes from Latin for "little grape"—no joke. If it's inflamed and a bit larger, it's just called a uva or, you guessed it, "grape." Haha, those Romans, such a sense of humor! I can see the resemblance . . .
Anyway, this little fleshy, hangy-down thingy actually has a use! A few actually.
First, it is useful in language. In English, we use it when we make a sound like "huh." This sound is formed in the back region on our throats. It's called a glotteral consonant. The other sound is called a glottal stop. That's when we say something like "mountain," but we don't annunciate the "t" sound. Instead, it kind of sounds like this: "moun-uhn." I would imagine that other languages, especially African ones, would use this neat little feature more. Use number one.
The other uses are more biological. We have to be a little more careful with use number two. When you massage the uvula, it can induce vomiting. This could be a great thing if you just ingested something you shouldn't have (e.g., poison, spoiled food, etc.). Unfortunately, this is also the method many people suffering from Bulimia use to purge their bodies of the nutrients they actually need.
Use number three, the uvula, as part of your soft palate, moves upwards, towards your nasal cavity, to block it off. This is to prevent something called nasal regurgitation. In other words, to prevent things like food and drink from going up your nose. I'm sure most of us are aware of the discomfort this causes.
These are three great uses of your uvula, so just be grateful you've got one!
I got most of my information from good ol' Wikipedia.