Joined the Firefly Brigade Critical Mass Ride (CMR) to Malabon and Navotas but suffered a flat in San Juan. Couldn't catch up with the peloton so I had to turn back. Side note: Some douchebag resident of a condo in Emerald with his ugly Boston terrier walks up to the entire group of 100+ bikers and tells us we shouldn't be gathering in Emerald St. telling us to leave..