An ice cream float or ice cream soda (also known as a spider in Australia, New Zealand), is a chilled beverage that consists of ice cream in either a soft drink or a mixture of flavored syrup and carbonated water.
Large frozen drinks are $1 and the spider version $2 via the Hungry Jack's app under 'Frozen Drinks'. Not sure how much the large are usually, though the mediums are showing as $3.60 …