Well, I'm not trying to do a clickbait thing here, but when I post like that it's a specific intent and reason. There's a reveal or punchline which is robbed of all humour or interest if you just lay it out blandly from the beginning. It's no fun if I'm just some sort of re-linking bot.
It's basically for the same reason that explaining a joke kills it. Now, sometimes we don't get a joke - but here's there thing: That's perfectly okay. There's nothing wrong with saying "I don't get it".
The way I look at it is that if a few people don't get a joke, but most do, that's still a net gain. And maybe I don't always make it, maybe I think it's funnier than it is - I'm not Conan O'Brian. But I like to try and provide you guys with moments of laughter or genuine surprise.
In any case, I'm actually kind of surprised that you didn't notice it, given you live in the countryside and while (IIRC) you don't use guns regularly or at all, you'd at least be familiar enough with them to know how absurd a chainsaw bayonet is (and I don't mean this in a sarcastic "pfff YOU didn't GET IT?!" way... I'm honestly and legitimately surprised as to how you - or most anyone really - would get a mental image of a chainsaw bolted to a gun and thinking "Sure. Makes sense.")