Mine

on *:text:!addban*:#:{
  if ($nick isop $chan) {
    set %ban. [ $+ [ $2- ] ] poop
    ban -ku5 $chan $2- Blacklisted
    msg $chan $2- has been blacklisted, please dont use that name.
  }
  else notice $nick you need op or hop to do this.
}

on *:text:!delban*:#:{
  if ($nick isop $chan) {
    unset %ban. [ $+ [ $2- ] ] 
  }
  else notice $nick you need op or hop to do this.
}

on *:join:#:{
  if ($me isop $chan) {
    if (%ban. [ $+ [ $nick ] ] != $null) {
      ban -ku30 $chan $nick Blacklisted
    }
  }
}