About 20 years ago I thought of making a smaller mouse for computers - for kids & people with small hands. I was going to call it the "Minnie Mouse" ....then my colleague pointed out they had already been invented, and were just coming out in the marketplace.
I have been guilty many times over the years of MacGyvering stuff up...but never to the point of it been a worthwhile innovative invention.
Here's a Security measure I put together for our office back in 2003....
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A pair of old sunglasses with the right lens missing - and a red LED for an eye. people would walk past, look, and nearly crap themselves when they saw the eye.
And more recently - about 2016, my manager asked me to create a Lockbox for the keys at work for various sites, and number the keys, and also generate a list with details etc. After nagging me for several weeks, I eventually knocked this up...an old Advertising sign we tore down.
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Sheets of A4 paper duplicated....he was not impressed. The other guys and Managers got a good laugh out of that.