I work at the PHC. I've become known as the "bike guy." Once a year I bring my tools to work and fix all the bikes for the employees. I do it to encourage people to get out of their cars and commute by bicycle.
I used to ask for a donation and give it to charity, but I don't want to deal with money. I do it to spread good will. And to spread the faith of the holy trinity: play-excercise-transportation.