WARNING: NOT TO BE TAKEN SERIOUSLY!
I first came across this “theorem” in the runup to the 1992 World Cup. Its statement is:
If the World Cup tournament is held in a white-majority country, it will be won by a “non-white” team.
If it is held in a non-white country, it will be won by a “white” team.
Consider the instances before then:
1975 in Eng, won by WI True
1979 in Eng, won by WI True
1983 in Eng, won by Ind True
1987 in Ind/Pak, won by Aus True
Now we see how this theorem worked after someone had deduced it:
1992 in Aus/NZ, won by Pak True (5 out of 5 so far)
1996 in Ind/Pak/SL, won by SL False (for the first time)
1999 in Eng/Neth, won by Aus False
2003 in SA/Ken/Zim, won by Aus True (we consider SA to be a non-white country)
2007 in WI, won by Aus True
2011 in Ind/BD/SL, won by Ind False
Thus this theorem has worked in 7 out of 10 cases or 70%
Now figure out which of the following contenders will win in 2015: Ind, Pak, SL, BD, WI