Help, /r/SA, how do you get your child to stop talking so much and being disruptive in his kindergarten class?

My son is naturally very talkative and enthusiastic about everything. He is also very impulsive, and honest to a fault. He is constantly getting in trouble for talking out of turn or being out of his seat. I've been to more than one parent-teacher conference as a result of his behavior, however academically he is at the top of his class. This isn't an issue with intelligence (in spite of the genes he received from his mother), he has a memory like a steel trap, and forgets almost nothing once he's heard it.
I've grown to depend on you, r/SA, don't let me down this time!