Murphy's Law
The number of open service windows at banks, post offices, airline counters, etc., always equals \[n/2 \- m\], n being the total number of windows and m being a random number between 1 and the total number of windows minus 1\.
The number of open service windows at banks, post offices, airline counters, etc., always equals \[n/2 \- m\], n being the total number of windows and m being a random number between 1 and the total number of windows minus 1\.