Adair's Scampering Spider

Performer displays 7 illustrated cards - 6 with cobwebs and one with a spider. A cobweb card is placed aside. The spider card is now reversed face down with another web card in the fan. A spectator is asked to pick the spider card, but it proves to be a web card. This is repeated over & over, but they all prove to be web cards - where has the spider gone? The web card originally placed aside is reversed - and there is the spider, nesting in his web!