Galactic center black holes:

in the centers of galaxies are probably black holes with millions or billions of times the mass of our Sun.
In short: falling in to a stellar mass black hole would kill you before you reached the event horizon, but if you fell into a supermassive black hole in the center of a galaxy, you'd notice nothing strange without looking out your window!
If you fell into a stellar black hole, you'd be killed by the tidal forces before ever reaching the event horizon. Assuming you fell feet first into the black hole, gravity would put more strongly on your feet (closer to the black hole) than on your head. You'd stretch out until you snapped and died. Yuck.
But the tidal forces are much stronger for a low mass black hole than for a high mass black hole!Why? Well, the force of gravity is G M₁ M₂/R². For those of you who know some calculus, thederivative of this with respect to R tells you how much the force changes as distance changes. So to find the difference of force between your head and your feet, you multiply the derivative of G M₁M₂/R₂ by your height. This is proportional to M₂/R₃ (let M₂ be the mass of the black hole.) Now, as you approach the event horizon, you're approaching the Schwarschild radius R_s=2 G M₂/c². So overall, the tidal force on your body is proportional to M₂^-2, or in other words, the greater the mass of the black hole (the greater M₂), the weaker the tidal force! Even if you went through the event horizon of a high mass black hole where the tidal force is low, you'd still fall towards the very center, where there's a singularity--a point where the density becomes infinite. When you get too close to the singularity, at a point within the event horizon, then the tidal force will pull you apart!
Right now we have no evidence for singularities. In fact, it's been theorized that "naked singularities" can never be seen, that every singularity is shielded by an event horizon, which prevents us from ever learning about it.
Now, if you were smart enough to convince someone else to enter the black hole for you, you wouldn't have to get killed!