Care for a little language? My heart leapt a little when I read the following in the New York Times — this was an article by Fox Butterfield about prisons: "But Texas officials say they learned the seriousness of cellphones' being smuggled into prisons only during a recent undercover investigation of a violent gang . . ."
I could kiss that apostrophe at the end of "cellphones" — exactly right. You would say (should say) "the seriousness of their being smuggled into prisons," not them.
I understand the justification - but I don't recall ever seeing this use before.
(Here is the link to the complete article by Jay Nordlinger: