I have a PhD in Wobbleogy (The study of wobbles), and have finished a Masters* in Commuting. (uhh..ok)
I have been a public commuter since the beginning of time itself, so believe me when I say that knowing the rules of “Stability” and “Center of Gravity” has saved my face from kissing the bus/train floor for a gazillion times now.
To keep things short: Keep your legs apart when standing in a bus/train so you won’t wobble, or worse, fall flat on your beautiful face.
A friendly reminder from me. :3