It is a safety feature as it is the one thing which is guaranteed to stop Audi drivers tailgating you. And because the bore of the end can is so wide, it also makes a huge bang, like a cannon going off. I did for a moment toy with the idea of seeing if I could use it like a mortar, to fire a potato over the workshop roof, but then I realised I didn’t fancy having to explain on an insurance claim form how I managed to break someone’s living room window from half a mile away
