I.willBuyMilk (err, milk) ->
  if err
    console.log "I was unable to buy milk. I thought milk was ubiquitous?"
  else
    I.willBuyIceCream (err, iceCream) ->
      if err
        console.log "Sadly, I was unable to buy ice cream"
      else
        I.willBuyChocolateSyrup (err, syrup) ->
          if err
            console.log "Argh! So close, yet I will still not have a milkshake"
          else
            console.log "Victory is mine!"