I couldn't find any numbers for April Fools stuff, other than an off-hand estimate of "a few hundred million", which seems about right. But here's a list of a

I couldn't find any numbers for April Fools stuff, other than an off-hand estimate of "a few hundred million", which seems about right. But here's a list of a few other things which cost the U.S. in lost productivity (http://www.washingtonpost.com/blogs/wonkblog/wp/2013/07/06/here-are-all-the-things-that-supposedly-cost-the-u-s-billions-in-lost-productivity/ http://www.washingtonpost.com/blogs/wonkblog/wp/2013/07/06/h...): - Heavy drinking, 220 billion/year; - Smoking, 92 billion/year; - Commuting, 90 billion/year; - Changing passwords, 16 billion/year; - Spam, 21 billion/year; and my personal favorite, - Screwing around on the internet when you should be getting work done, of which Reddit is a significant contributor, 134 billion/year. If I were witty I could have a lot of fun with that last point.