I've realized some pretty sneaky tricks fast foods pull on people. For one, the McFlurry. Priced at $2.25, it has 4oz of sundae mixed with an ounce of the topping you choose. A regular sundae is $1.38 with just the syrup topping. It's $1.69 with a topping like say M&M's or Oreos. The cup itself is also 4oz. Meaning it's the same amount as the McFlurry. There are more, but I forgot them.