Looks like one of Bluebird's creations to me!!!
Hi there Bartapuss my friend, are you going to tell them all why Bluebird developed this - or, no, perhaps I should....it was developed to place inside of Bartapuss' mouth and to trigger off and inflate to prevent him coming out with some verbal diarrhoea - but it was very quickly realised too many would be required to be placed in his mouth. So, therefore, we have decided to sell them on Ebay - there you go Bartapuss and as Ann Robinson would say - Bartapuss you are the weakest link GOODBYE
AYE
John E
bluebird