Watch for the konami code on your page

konami.coffee

userInputs = []
konami = [
  38, 38, # ↑ ↑
  40, 40, # ↓ ↓ 
  37, 39, # ← → 
  37, 39, # ← → 
  66, 65 # B A
  16, 13  # ⇧ ↩ (shift, enter)
  ]
 
sameArrays = (a, b) ->
  return false if a.length != b.length
 
  for value, index in a
    return false if value != b[index]
 
  true
 
$(document).on 'keyup', (e) ->
  key = e.which
 
  if key == konami[userInputs.length]
    userInputs.push key
  else
    userInputs = []
 
  if sameArrays(userInputs, konami)
    alert('konami') # do something cooler than that
    array = []