Missing the weirdest one, which I sadly can't find on the net right now because I lost the name:
What's the average population size of alien planets when you are one in 7 billion having this question.
I don't quite get it together but it had 2 interesting problems:
- It allows for a prediction with a simple size of just 1 which differed from said sample
- it's debatable if we should calculate with 7 billion humans or one globalized "intelligent" race
If anyone could point me to a source to this I'd be happy :)
also related: the german tank problem https://www.eadan.net/blog/german-tank-problem/