Add this code to your script:
if IsButtonPressed(10, 0) and IsButtonPressed(8, 0) then
PedSetActionNode(gPlayer, "/Global/Ambient/HarassMoves/HarassShort/Shoves", "Act/Conv/Ambient.act")
Play the arcade machine in the boy's dorm, lock on to someone and pressed the jump button.
Remember, these voices only work on other characters only (Jimmy won't say anything).