What's the one sketchy BH method that surprisingly worked when all else failed?

Everyone chases the same 'guaranteed' methods, but sometimes the real money comes from the weird, overlooked tricks that shouldn't work - yet somehow do. What's your most underrated BlackHat tactic that quietly paid off when everything else failed?

There are no 7 second weird blackhat hack that still works. Lot of methods still works but if someone post it here them there will be too many people trying it and it will be patched.

Yes, you're right, most likely, no one will tell interesting things.