Today I was riding behind another cyclist, in the bike lane along the right hand side of a string of cars waiting for a red light. Sure enough, just as we were nearing the front of the line a garbage truck at the front flipped on their right-hand-turn signal, and started to make a turn. I was way back, and going relatively slowly, so I merged into the lane, and went around the truck on left-hand side. The guy in front of me tried to pass the truck on the right, and seemingly got his rear tire clipped. No-one was hurt, but as I was riding off, I could hear him get into a yelling match with the driver. I briefly thought about going back and letting the cyclist know that he was an idiot for trying something so clearly life-threatening (while also letting the garbageman know that not all cyclists are idiots), but I figured it was a nice day and I wouldn't really have been helping anything, and so I just kept on riding.