Don't you just love experiments?Here's one that just came in my mind.
We try to simulate random choice with computers, but ultimately the only thing capable of real randomness is a human being. Or is it?
If you flip coins your results should converge to about 50-50 heads-tails the bigger the number of throws is. If you try it a thousand times and you still get 30-70, then your coin is false. Now if humans are able to create randomness they should also give a 50-50 result. Let's check that.
I've included a poll with four options. If we are able to create true randomness we should get a 25%-25%-25%-25% result for the options if our population is big enough. So please make your choice, just select the first option that comes to mind (and don't check the results before you vote!).