I've had this picture on my phone for a while now and kept forgetting to post it. On the right is a 'regular' sized soft drink from Burger King. On the right is and extra large (I don't think they're allowed to call is supersize anymore!). The different is ridiculous! The regular looks tiny!!
I should have also taken a picture of the chips/fries though. There was barely a difference in those- The large portion was actually quite average sized.