Doppelganger effect

A causality exists in which after spending enough time with your best friend you start to dress, look, act, and eventually think the same as each other.

“Notice how those two guys sitting together on the bus have the same sunglasses, rings, haircuts, phone brand, shoes, etc. That’s the doppelganger effect. And look in the seats behind them are two girls who dress, tilt their heads and even laugh exactly like each other too”