You could argue that "use strict" does the same, except it's language mandated. But yes, you have a point. These are not particularly fun, if you are on the receiving end. I've seen more than enough hair-raising bad JavaScript to last me a lifetime.

But you gotta admit, if you're on the pranking end, it could be fun to see someone tear their hair out.

Or my sense of humour is way out of whack. probably the latter