Have you also heard something really stupid being blamed on Satan????
I remember reading WTS blurbs warning dubs to be careful accepting any kind of gift from "unbelievers," because Satan might have squeezed a bit of his evil into the gift, however innocuous it looked.
The story usually ran something like this: "Sister Dub was given a potholder from her unbelieving [and therefore evil] mother-in-law. Terrible events ensued: dub sees objects flying through the air and hears things that go bump in the night. Sister Dub suspects the potholder, throws it out, and all is hunky-dory in dubland again."
On the other hand, I think it's really stupid when I see sports teams (on both sides) praying to God for a victory before a game. The vastness of the whole (supposedly created) universe, and they think God is interested in their game?