Just to upgrade your script a slight bit, incase they want groups of nicks replied to in some way

Code:
on *:JOIN:#USF:{
  if ($me == StupBot) {
    if     ($istok(basicer davec robbyrob peter,$nick,32)) { msg $chan Hey you sad sad cases! }
    elseif ($istok(yahoo yabbab yayayaya,$nick,32))        { msg $chan Hey one of the y boys are here! }
    elseif ($istok(zorro,$nick,32))                        { msg $chan Onguard! }
    else { msg $chan Good for you to join us $nick ! }
  }
}