all the time. especially on bridges (williamsburg bridge anyone?). some people just seem to take it as some personal affront. God forbid I don't want to inch along up a steep upgrade because I have 26 less gears than you. or even, god forbid i happen to be riding faster. I especially love the freewheeling guys that get up out of the saddle as soon as I pass, mash as hard as they can, then coast for a quarter mile to recover once they pass me. or the roadies in central park...a kid on a fixed gear with jeans/hoody instead of spandex and a mess bag instead of a camelback is like a red cape to a bull...