It's not exactly the most fantastic inflation scene ever, but it was mainstream, prime-time British telly, so that kind of makes it special. There was a lesbian wedding on BBC-1's 'Casualty' at the weekend where one of the wives was heavily pregnant, so her three bridesmaids and her wife-to-be all stuffed vinyl inflatables up their dresses for empathy's sake. There were rubbery balloony noises involved too. Here are a couple of screencaps:
http://s29.postimg.org/9u6owhkzr/threebellies.jpg
http://s27.postimg.org/z9yaibbjn/empathy.jpg