With torture being in the news so much recently. it made me think of this bird feeder we saw on the Parkside Garden Tour last year, one of the many garden tours around Buffalo. I don't know how well it reads in the photo, but the owner of the birdhouse has attached a metal slinky around the post that holds up her bird feeder. I asked her if it was an effective squirrel deterrent. She said no, but it slowed them down and they were much more entertaining to watch trying to get up the pole. Wish I had squirrel pictures to show you.
For the squirrels around my garden, I'm considering water-boarding.