As dangerous as this is, is this even possible?

All I can say is that here in SE Florida since Hurricane Wilma this week,
with 6 million people out of power, with my neighborhood as a sample, there
must be about 1 million backfed generators hooked up and running. It is
not just commonplace; it is the norm.

One neighbor had a (gypsy) electrician install a 4-wire twist-lock socket
in his garage specifically for backfeeding through a suicide cord.

Just stand in the electrical aisle of Home Depot for 5 minutes. You will
see a steady stream of people buying wire and plugs and asking how to make
a backfeed connection.

The same thing happened on a slightly smaller but still massive scale last
year after Hurricanes Jeanne and Frances. I don't recall any reports of
utility workers or users being harmed by the practice. There were
certainly more people poisoned by carbon monoxide from generators than hurt
or killed by electrocution from backfeeding or other misuse.