I have a very lucky and somewhat stupid story to share.
I became a little obsessed with the Wild Gambler slot. It has Locked Wilds and you can add them at will, providing you're willing to pay more per spin. The better they are, the more you pay, etc., If they are active when the free spins launches, they all remain and you can win big.
I was betting about €1 per spin and won €200 without using Locked Wilds. In a moment of madness, I decided to locked half a dozen wilds in place and spin. I think it was about €30 per spin in the end, which is huuuuge for me. I ended up mostly breaking even for about 10 spins and with my last €30, the free spins hit. I have never been happier in all my experience playing slots.
By the end of the spins, I had about €3,000.
The story should have ended there. However, in my stupidity, I decided to risk €500 of that, because why not? I lost all of it, and then decided to risk another €500. And another. I'm sure you know where this is heading, but needless to say, my biggest win turned into my biggest loss in the space of 10 minutes.