I like to imagine there being a hole going right through the middle of earth that people jump through (Without having to worry about dying from anything along the way (All I care about right now is gravity and the fact that the average human can survive for about 2 days to a week without water)) and either fly out the other side and die from the impact of falling on that side (red), fall back into the hole and die on the side they started on (blue), get stuck in an endless loop of falling from one side to the other (green), build up so much momentum that they shoot themselves into space (orange), be unable to build up enough momentum to make it to the other side and start falling back the way they came from and die (purple), or be unable to build up enough momentum to make it to the other side (or back where they started from) and are now trapped in the center of the earth until they die of thirst or something (pink).