A Babul
A Babul is a brainiac with a gift of gab who will still give you a free drink if you ask nicely.
He turned a 5-minute conversation into a 30-minute lesson on the importance of vowels.
He gave a free soda to everyone in the room just because he felt like it.
He explained why the Earth is round during a 2-minute break and still had time to talk about the moon.