Stellar black holes are so-named because they are only "sort of" more massive than our sun, in contrast with supermassive black holes that can stomp an entire galaxy into oblivion because they feel like it.
There are thousands of these stellar black holes floating around space. The problem is, we have no way of finding them unless they interact with another stellar object and we happen to see it. One way they interact is by completely annihilating the object (in fact, that is their preferred method--they're kind of dicks about it).
In other words, a black hole could be right next to our solar system and we wouldn't know it until it starts snacking on the sun.
The sun will suddenly start unwinding itself, and then everything will go black. Soon after the black hole will begin the process of collapsing all matter into a single point. So you, your mum, your couch, your porn, the Pacific Ocean and a billion Chinese people will all be crushed into an area the size of a golf ball.
It'll look like this, only less photoshopped.
The good news is that you won't live to see that. The first thing that happens to you after you get sucked into space is that you get "spaghettified." That's the actual term used by scientists, and I'll let you use your imagination as to what it means. Hint: it has nothing to do with the black hole feeding you lots of delicious spaghetti.