Seems like the number of BART commuters who dress up for Halloween decreases each year! Even in the office, I see candy everywhere but fewer people cared enough to wear a costumes than the last couple of years. Some horns, some wigs, but few costumes.
It's a relief for me actually. Elaborate costumes and masks on BART and around the stations used to really scare me anyways. I didn't quite like strangers dressed up as "Jason" or vampires coming up to me to get a reaction. The more I tried to avoid them, the more they wanted to follow me.
Popular ensembles this year from what I've heard, read and seen -- Wendy's wig, Hillary masks, Bush masks with a noose, and Larry Craig with a stall.