you should totally wear a costume to work

Someone did a study to see if more people would donate to a costumed character versus a plain clothed person. They set up two Salvation Army donation buckets, one with Santa costumes, and one without. The results? People don't really care.

This particular survey doesn't seem so scientific, and doesn't really take into account Salvation Army's brand power as a motivating factor, location of donation centers, etc - but that shouldn't stop you from wearing a costume today, just for the fun of it. (Just tell your coworkers that you're part of an experiment.)