In the last few years, Internet organizing has led to self-directed flash mobs that gather to engage in pillow fights
or dance to the "Sound of Music" soundtrack
. On Wednesday, April 15, it led to tax day rallies--also known as tea party rallies--appearing spontaneously in as many as 500 cities, without any central organizing body. Instapundit blogger Glenn Reynolds says: "Though critics will probably try to write the tea parties off as partisan publicity stunts, they're really a post-partisan expression of outrage."