On Vox: summing it up

School for Scoundrels is like Meet the Parents crossed with Very Bad Things.

Originally posted on herbaliser.vox.com

i need to know

why do so many web sites needlessly append "_pf" to their html files? I mean seriously, it causes 404 errors till you take that off. does anyone else know what I'm talking about? i first saw it on TWoP but am seeing it elsewhere lately, like 4 other sites in the past two weeks. wtf?