I keep seeing adverts for what's basically a bedsheet with £5 worth of copper wire in it sold at a ridiculous price as an "earthing mat". Not only is this shamelessly a scam, it also plugs into the mains so if they wire it badly (which as a shameless scam seems pretty likely) that's 240 V directly into your sleeping body. I've reported it as a scam so many times but nothing gets done.

If that bullshit worked you could just throw yourself in the sea for free rather than paying some pillock on Facebook. No better connection to earth than that!