Over at 538, Benjamin Morris asks "Just How Bad Were the Bad Boys?" The bad boys in question are the Detroit Pistons basketball team of the late 80s, who had a reputation for being unusually aggressive on the court. Did they deserve their reputation? To test this, Morris looks at how many technical fouls they racked up, a good measure of unsportsmanlike conduct. In fact, he takes a look at the total number of technical fouls for the entire league, and finds that the number rose steadily until 1995 and then started a long-term decline.
I promise this is just for fun, but I've overlaid another line against Morris's chart. Not a perfect fit, granted, but not too far off, either. I'm sure a few of you can guess what it is, can't you?