Three Interruption Tokens
Give a student who consistently interrupts three tokens at the beginning of each day. He may use the tokens to talk to you for a set period of time when you are not teaching. He has your undivided attention to talk to you about anything at all. He knows he will have your undivided attention for that designated period of time. Be precise about the time period. You can even make it as short as a minute, as long as you are willing to give him your undivided attention for that period of time.