Nah, not at all likely to make them dead, your typical home generator just doesn't put out enough juice to kill most of the time. It's almost like people on slashdot didn't play with electricity as a kid =) The worst shock I've ever received was from a 10KV fly back transformer in an old Sun SLC workstation (it was the part for powering the CRT). That jolt blew a hole in the screwdriver I was using and threw me a couple feet and knocked me out.
Pure nonsense. That flyback is 10kv at a very low amperage. The voltage/amperage sent back over the powerlines from a home generator is plenty to kill someone. It could also kill you at th 120/240 volt level if you get into that.
Furthermore, what happens out on the utility lines, grounded or at 12kv, might very well toast your generator and maybe put something on file.
Many a safety minded lineman has had a good chuckle about the *deserving* generator user that foolishly endangered lives with a backfeed.
DO NOT hook up directly. Please use a transfer switch or just hook up extension cords to your appliances.
Stay out of court.
PS. The power company I work for did not tell me what to say....