"You two get on the bus. One sits in one row, the other the row in front or behind. Why not sit together? You don't know each other well? You like your space? It's stupid to constantly turn your head behind to talk to your friend behind. It annoys. Better yet, stay sitting backwards talking. Just sit together. And your dirty nasty shoes sitting sideways and put your feet up on the seat.
It's as if you've had a hard day, mud, germ shoes on the seat for the next person to sit on yet place their hand on for some reason. It's absurd you sit sideways to look at your profile, I never would've thought looking at the back of your head I'd like any less.