I'll have to try one of those.
I'm not sadistic, I like animals in general, but really won't lose any sleep about mice having a slow or uncomfortable death. I cannot keep them out of my shed. It's a small 8x8 I built just to store targets, some small tools, little items I wanted put up, convenient to access, somewhat secured from growing legs, but not so much I wanted to carry them down to the shipping container & deal with getting in/out of it all the time.
Anyway, my little shed instantly turned into CMVs shelter for homeless wasps, lizards, & mice. So we cleaned it out real good, lots of diluted bleach, cleaned up the mess....I sealed everything up with many cans of the black can great stuff expanding insulation. Re-hung the door to close gaps near the bottom. Spread a bunch of mothballs around & under it to discourage...whatever a mothball will discourage. Got deer corn or anything that seemed like food out. Used big plastic totes or shelves for anything paper or that looked like it would be nice to shred up for a nest. Pretty much whatever I could think of to make it unwelcoming. Didn't take 2 weeks & the mice had chewed thru the insulation to get back in. They decided the little catch bag with some sawdust on my miter saw would be a great home so proceeded to destroy it. Since they saw how much we enjoyed cleaning out the shed first time, they re-covered the floor in mouse pee & poo so we could do it all over again. Used the green bait poison blocks (which I hate since we have lots of hawks & a few owls & I think those have a good chance of causing a secondary kill on them) and snap traps. That worked for all of a month, then the green blocks went untouched - they learned to not eat that. They also avoided the snap traps so switched from peanut butter to cheez whiz and after 2 weeks they learned to avoid that too.
So they've pretty much denied me the use of that shed for the reasons I built it. Anything I keep in there, they chew up or pee all over. And since I went nuts with the spray foam trying to keep them out, it isn't ventilated any longer so the the pee & poo smell is overwhelming. And as an added bonus, it doesn't take the snakes all that long to figure out "there's always mice in there. I should be in there too!" So far just black snakes & I scoop them up in a 5 gal bucket & carry them a mile down the road to live somewhere else. But plenty of harmful snakes running around too and they probably think mouse tastes like chicken just like the black snakes.
So I tried. Tried to discourage them, tried to kill them humanely. And although I realize they aren't plotting against me or antagonizing me on purpose, I have 0 compassion for them. Die fast, die slow, I don't really care....just die at this point.