It would be just like you to pick something as insignificant as a missing apostrophe (in what is already purposely a grammatical nightmare, I might add) and harp on it for an entire posting. I'm sure you've never made a typo in your entire life. But I'll be waiting until you slip up and then, BAM - the old fork in the eye.
Incidentally, the only visually jarring thing around here is your face.
Furthermore, are you sure you know what a gerund is? Because I don't see a single one in that title. Without the apostrophe in "thems" what I see is an overly-plural pronoun, a copulative1 adjective and a plural noun. But hey, thanks for comin' out.
1. It has been a while since I got to be copulative. You?