I updated this scrip changed the code and added bedtime... it also goes well it http://hawkee.com/snippet/6809/

have fun as i learn :) also thanks to H0LLYWOOD & Stewie for the insight

on 1:text:*dinner time*:#: {
  var %bt.rand $rand(1,3)
  if (%bt.rand == 1) { .msg $chan eat well $nick }
  if (%bt.rand == 2) { .msg $chan hurry back $nick }
  if (%bt.rand == 3) { .msg $chan east coast dinner time! }
}

on 1:text:*lunch*:#: {
  var %bt.rand $rand(1,3)
  if (%bt.rand == 1) { .msg $chan eat well $nick }
  if (%bt.rand == 2) { .msg $chan dont forget to comeback back $nick }
  if (%bt.rand == 3) { .msg $chan do you know what time it is? }
}

on 1:text:*bedtime*:#: {
  var %bt.rand $rand(1,3) 
  if (%bt.rand == 1) { .msg $chan sleep well $nick }
  if (%bt.rand == 2) { .msg $chan dont let the bed bugs bite $nick }
  if (%bt.rand == 3) { .msg $chan so early $nick  }
}

on $*:TEXT:/^(brb|gone|afk)/Si:#:{
  if (!$readini(idle.ini, $nick, time)) {
    set %away $nick
    writeini idle.ini $nick time $ctime
    msg $chan Alright, ill start my stop watch..
  }
  elseif ($readini(idle.ini, $nick, time) >= 1) {
    msg $chan $nick $+ ,you are already marked as brb, Please say "back" when you return!
  }
}

on *:text:back:#:{
  if ($readini(idle.ini, $nick, time) >= 1) {
    unset %away
    msg $chan Welcome back $nick you were gone for $duration($calc($ctime -$readini(idle.ini, $nick, time) )) $+ , aboot time brah
    remini idle.ini $nick
  }
}
on *:TEXT:!ClearAway *:#:{
  if (!$2) { msg $chan Please specify a nick!
  }
  else { 
    unset %away
    remini idle.ini $2
    msg $chan $2 $+ 's brb time has been cleared.
  }
}
On *:TEXT:*:#: {
  if (%away isin $1-) {
    msg $chan Sorry $nick but there marked as brb at this time, they will say back when they return.
  }
}

my first ever script enjoy it lemme know what you think. you can change the script up if you want

triggers: dinner time /lunch /bedtime