alias -l firetimer {
  if (%up > %down) {
    msg %kickchan Vote passed! Yes: %up - No: %down
    kick %kickchan %nick
  }
  else {
    msg %kickchan Vote Failed! Yes: %up - No: %down
  }
}

on *:text:!votekick *:#: {
  set %kickchan #CHANNEL
  set %kicktime 15
  set %exceptions
  if (%voteon == on) {
    notice $nick A votekick is already taking place.
  }
  else {
    if ($nick isop %kickchan) {
      set %nick $$2
      set %voteon on
      if (%voteon == on) {
        .timer 1 %kicktime firetimer
        .timer 1 %kicktime set %voteon off
        .timer 1 %kicktime unset %voted
        .timer 1 %kicktime set %up 0
        .timer 1 %kicktime set %down 0
        set %voteon on
        msg %kickchan Voting to kick %nick has started. Type !yes or !no to vote.
      }
    }
    else {
      notice $nick You need to be a channel operator to call a votekick.
      halt
    }
  }
}

on *:text:!yes:#: {
  if ($istok(%voted,$address,32)) {
    notice $nick You have already voted.
    halt
  }
  if (%voteon == off) {
    notice $nick Voting is currently off.
    halt
  }
  else {
    %voted = $addtok(%voted,$address,32)
    inc %up 1
    msg %kickchan Yes: %up - No: %down
  }
}

on *:text:!no:#: {
  if ($istok(%voted,$address,32)) {
    notice $nick You have already voted.
    halt
  }
  if (%voteon == off) {
    notice $nick Voting is currently off.
    halt
  }
  if (%voteon == on) {
    %voted = $addtok(%voted,$address,32)
    inc %down 1
    msg %kickchan Yes: %up - No: %down
  }
}

Revised to be a game for channels.