MummyEd did some self-bondage on the streets (and public transit systems) of San Francisco:

MummyEd comes up with some original ideas. He wanted to do some self-bondage in a very public way. The addition of MISTER S ICE LOCKS makes it even more interesting. The hoodie idea was from a friend who hauls his partner around the clubs of LA. The locking transport belt has a metal ring that slips into an opening in the front pouch. A set of handcuffs go through the ring and you are trapped in secret. MummyEd suspended the key out of reach with an ice lock. This would take over three hours to release, which gave plenty of time to take a ride on some public transportation. He headed for a kink-friendly coffee shop, where MummyEd locked his wrists in the handcuffs. After some shopping and sightseeing, he headed for the public transportation. The titillation of public bondage is fun because from this point on, you will try to imagine who else has a secret.

ICE LOCKS available here

You can see more of this at Serious Male Bondage