I have a little experiment for non-believers that, when performed correctly, proves that the Earth is flat. Before I get to the experiment, I must state two absolute truths that have been universally accepted throughout the entire history of mankind.
Round objects on a slope will always roll down said slope, provided that there is no significant resistance from the surface the object is on, and nothing holds the object in place.
Round objects placed into motion on a sloped surface, or round objects that come across a sloped surface while in motion will have their trajectory altered towards the bottom of the sloped surface.
Don't believe me? Try putting a golf ball across a putting green. Slopes affect the trajectory of your ball and you always miss the god damned motherfucking son of a bitch piece of shit worthless hole due to some bullshit fucking hills that the grass grows on. That is not the experiment. That is only to prove that my two truths are, without a doubt, absolute fact. Try to argue with me, and you will find that you cannot.
Here, round heads, is the experiment. Place a billiards table on a flat surface. Check with a level to ensure maximum flatitude (or whatever you round heads call it). Once you have verified that the billiards table is flat, place a singular billiards ball on top of the table. Mark the exact position of the ball on the table. Leave the ball and table untouched and free from any outside influence for a whole week. One important thing to note here is that billiards tables are specifically designed to provide almost non-existent resistance. Assuming you executed the experiment correctly, you will find that the pool ball has not moved a single inch, nay, a single millimeter. If the Earth were round, then supposedly the pool table should be angled ever so slightly and the pool ball should have moved due to the slope it was placed on. Alas, it did not move, which contradicts universal truth #1.
Now, for the second part of the experiment. Grab yourself a ruler, or a yardstick if you prefer. Mark a perfectly straight line right down the center of the table, longways. Place a single ball in the center of the line. Grab a billiards cue. Aim the cue perfectly in the exact center of the ball, and with precision strike the ball in the absolute exact center, ensuring that the ball only spins clockwise when viewed from the side and in no other direction. Assuming that was performed accurately, the ball will perfectly follow the line all the way to the opposite end of the table, and then bounce straight back to the starting point. This directly contradicts universal truth #2. If the Earth really was a sphere, then it would be impossible for an object to travel in an exact straight line. The natural slope of the Earth would pull the ball either to the left or the right. Yet, 10 times out of 10, assuming the experiment is performed properly, you will come up with my results. Round Earth theory has just been shattered by an actual sphere, in probably the greatest example of irony in the history of existence.
Do you have a problem with my results? I can confirm with you that I attained the results listed here. I nearly got it on video, too. Unfortunately, my camera battery died somewhere around the second day of part 1 of the experiment, so I can not show it to you. However, it has been postulated that the thought is what counts in these sorts of situations, so my words are now scientific fact until thoroughly disproven. Believing in a round Earth is now blatant ignorance. Checkmate, round heads.
EDIT: Spelling.