There are mushrooms growing in our garage!!!!?

I was looking for something in my garage a couple of minutes ago and I found a bunch of muchrooms growing out of the ground!!! (EWWW!!!!) The tiles in our garage are 50+ years old and have a bunch of cracks, I'm not sure if there's a lot of water, but it grew right out of the ground. And I have a heavy carpet and they little sickos made a whole and grew out of it. How do I get rid of them? Are they poisonous/ dangerous??