I've always assumed the fluffy, overflowing concoction created by combining "flavoured aerated water" (fizzy drink, soda pop - call it what you will) and a scoop of ice cream was globally known as a "Spider".

Is this the case?

(Compulsory order at the legendary Paragon Milk Bar in Katoomba, New South Wales (BTW, milk bar = cafe in NSW) is a pie floater, chips and a lime spider. Hmmm, is this why my cholesterol is 6.9?)

stales