What is something really stupid you purchased that turned out far better than expected?
I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn't work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I'd gladly replace if it broke.
My wife bought me a Beard Bib as a joke gift after I found it online one day. It's basically a smaller version of the bibs you wear when getting your hair cut, but with suction cups attached to the bathroom mirror to hold it horizontal and catch stray hairs when using an electric shaver. It looks ridiculous.
I now use it every time I trim my beard, even if my wife still laughs at me every time she sees me in it. Cleaning up all the stray hairs was always a pain in the ass, but this thing does a surprisingly good job at catching 99% of the hair, and I can just brush it all into the trash when I'm done.
My bathroom has the worst-designed sink ever, with a tap that's too long, a sink basin that's too thin, and a medicine cabinet that means that if I want my beard hairs to fall into the sink while trimming I have to literally have my face pressed up against the mirror which is, of course, not something you can do while trimming a beard. I got one of these things too and it's so good. 10/10, would buy again.
Alternatively, get a mirror that hangs on the back of the door and shave in front of that (if using a buzzer that you don't need to keep rinsing in the sink). It's so much easier to just grab the broom or vacuum cleaner and get it all off the floor in two seconds than chasing stray bits of hair around your faucet handles and random objects on your counter.
Also, if you do have to clean up those bits of hair on your counter, use a piece of TP. Wet it a little so that hair sticks to it better, then either fold each wipe into the middle or start a new piece before doing the next wipe so it doesn't just leave old hairs behind when you're trying to pick up more of them.