Mine

on *:TEXT:!warn &:#:{
  if ($nick isop $chan) || ($nick ishop $chan) || ($nick == rangedboyke) {
    msg $chan 4 $2 has been warned $($+(%,warn.ban.,$2),2) / 3 times! 12 typ: !checkwarn to vieuw how many times you have got warned!
    .inc $+(%,warn.ban.,$2)
    if $($+(%,warn.ban.,$2),2) == 3 {
      msg $chan *** 4 $2 has been warned 3 out of 3 times!
      .timer 1 5 .ban -ku600 $chan $2 Banned for warnings. - 10 minute ban -
      unset $+(%,warn.ban.,$2)
    }
  }
}

on *:TEXT:!checkwarn*:#:{
  if ($2 == $NULL) {
    notice $nick 4 You have been warned $($+(%,warn.ban.,$nick),2) $+ /3 time(s)!
  }
  if ($2 !== $Null) {
    notice $nick $2 4has been warned $($+(%,warn.ban.,$2),2) $+ /3 time(s)!
  }
}