Something

on *:JOIN:#:{
  if ($address($nick,2) == *!*@shawn.users.swiftirc.net) { msg $chan Welcome $nick $+ . Here is your Linux Penguin! | describe $chan gives $nick his pet Linux Penguin. }
  else { Msg $chan OMFG Welcome, here have a Monkey. | describe $chan gives $nick a pet Monkey. }
}