Had to pause my morning commute to admire such a simple and clever move by this guy — figure out which métro she uses, a cheap piece of chalk and you’re golden. Leave it to the most romantic city in the world to show new ways to send a love letter. Or how to be an effective stalker.
afrenchfryeinparis.com 
I prefer to think that this is a romantic gesture, rather than the work of a skilled stalker. Either way, as you observe: C’esta charmant, ça,
Sure is more romantic than the marriage proposal on a sheet with a spray can on the M6 freeway!