Walking around, I saw this … I always write a similar message on dirty cars in the parking garage, on kids’ drawing boards in waiting rooms, really any surface where I can doodle something. So, seeing someone else’s doodles during my evening stroll really made me feel so warm inside, knowing we are all really doing our part. 
Discussion
I... Can't condone doing that on cars since that will likely lead to permanent scratches in the clear coat of the car...
This is good but “Study Bitcoin” may be better