One of the great comedy tricks of modern times. The magician start to perform the classic '20th Century Silk Trick', but but finishes with a ladies bra knotted between two scarves.
Two scarves are tied together and given to a lady assistant for safe keeping, a third scarf is vanished by the magician on the pretence that it is going to appear between the tied pair. However, when the tied scarves are shown, a ladies Brassiere appears between them instead of the vanished scarf.
Great comedy magic.