There's one like that in my bio class. He's not even premed in a class that's 90% premeds, yet he's the one who asks every question, and they usually occur about once every ten seconds. We'll just be talking about animal phyla and he'll yell out stupid stuff like, "HEY DR. ____, have you heard about this new species of lizard they found in Ecuador?" and our professor just eats it up. I literally hear his awful voice in my sleep.
The worse part is, he's friends with my suitemate. So he comes into her room all the time and yells more stupid stuff and it's like he has nothing else to do with his life but make loud proclamations that are usually wrong.
My theory is that he thinks he's really smart, and he wants us premeds to think he's smart too. The only problem with that is that anyone in my class with an AP Bio background sees right through him.