If anyone remembers me asking for wind-up butterflies quite a long time ago, you may be pleased to know (or you may not care less) that although a number of butterfly sources were discovered, the scene in question was actually filmed with a different papery item entirely. I've seen the scene, and it works fine - there were some concerns that the effect I was after wouldn't have quite worked anyway: the effect being so random and fast, it would have been over before you knew what had happened. The amount of thought that goes into these things is slightly worrying, frankly.
Anyway, The Mighty Evans (now promoted at her workplace, so if you work at the BBFC and you've recently had a madwoman in a paper crown and a sceptre made of Cheesy Wotsits* ordering you to bring her coffee in a 'gold mug', that'll be why. She'll settle down soon), has sourced a tiptop and highly reputable supplier of windup paper butterflies, that seem likely to satisfy any reasonable person's desire to fill envelopes or books with propellable erstatz insects that, when opened, release themselves into the air in a startlingly violent manner likely to cause at the very least, a serious cardiac arrest. The suggestion is that you use these for advertising, but unless you're advertising those paddles you rub together and stick on people's chests whilst shouting 'CLEAR!', I think it could backfire.
Still, great work, the Evans - may your new role as Queen of Films last long and get you lots of perks and that.
*if you bite the ends off and lick them, they stick together - I once made a ET-style long Wotsit Finger at school lunch break and turned round to David Eddy, pointing it at him whilst doing a very creditable 'phoooooone hoooooome' bit. D.E. then flicked it with a fingernail, sending the ET Wotsit Finger to oblivion and leaving me with A) a hitherto-excellent impression suddenly weakened by the lack of an appropriate visual backup and B) no lunch. D.E. is now married and lives in Liverpool, where he presumably STILL RUINS PEOPLE'S LIVES.