2x2

today, in ohio city, i saw two different men, at two different times, on bicycles. and smoking cigarettes.

i also saw two different drivers, in two different cars, at two different times, use their arms, extended through their open windows, to signal a turn.

why do these things happen in pairs?

it's a corollary to that phenomenon for which i STILL don't know the name, where one hears a new word or idea for the very first time and then immediately hears it again.