Tell him "It's my anniversary" he will ask of what - then tell him as a child you had snapped one day and taken a gun your father owned and shot someone, they later died but beacause you were a minor they only made you seek therapy and you were placed on probation. When he ask why you shot the person explain that they were annoying in the exact same ways he is ! Tell him today is the first day that you are able to legally buy and own a gun again. Then tell him that you are on your way to go select one right now! Then twitch a little, stare right through him and mumble "that bas#$d deserved it"
THAT WILL GET RID OF HIM !